\( \DeclareMathOperator{\abs}{abs} \newcommand{\ensuremath}[1]{\mbox{$#1$}} \)
Formal Power Series in Maxima
1 Introduction
(%i1) | batchload ( FPS ) $ |
\[\mbox{}\\Version 1.0 \mbox{}\\Copyright (c) May 2020, Bertrand Teguia Tabuguia \mbox{}\\https://www.bertrandteguia.com \mbox{}\\bteguia@ mathematik.uni-kassel.de \mbox{}\\University of Kassel, Germany \]
(%i2) | f : exp ( z ) + cos ( z ) $ |
(%i3) | DE : HolonomicDE ( f , F ( z ) ) ; |
\[\tag{%o3} \frac{{{d}^{3}}}{d {{z}^{3}}} \operatorname{F}(z)-\frac{{{d}^{2}}}{d {{z}^{2}}} \operatorname{F}(z)+\frac{d}{d z} \operatorname{F}(z)-\operatorname{F}(z)=0\]
(%i4) | DEtoRE ( DE , F ( z ) , a [ n ] ) ; |
\[\tag{%o4} \left( n+1\right) \, \left( n+2\right) \, \left( n+3\right) \, {a_{n+3}}-\left( n+1\right) \, \left( n+2\right) \, {a_{n+2}}+\left( n+1\right) \, {a_{n+1}}-{a_n}=0\]
(%i5) | RE : FindRE ( f , z , a [ n ] ) ; |
\[\tag{%o5} \left( n+1\right) \, \left( n+2\right) \, \left( n+3\right) \, {a_{n+3}}-\left( n+1\right) \, \left( n+2\right) \, {a_{n+2}}+\left( n+1\right) \, {a_{n+1}}-{a_n}=0\]
(%i6) | mfoldHyper ( RE , a [ n ] ) ; |
\[\tag{%o6} [[1\operatorname{,}\{\frac{1}{n\operatorname{!}}\}]\operatorname{,}[2\operatorname{,}\{\frac{{{\left( -1\right) }^{n}}}{\left( 2 n\right) \operatorname{!}}\}]]\]
(%i7) | FPS ( f , z , n ) ; |
\[\tag{%o7} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{2 n}}}{\left( 2 n\right) \operatorname{!}}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{z}^{n}}}{n\operatorname{!}}\right.}\]
(%i8) | FPS ( log ( 1 + sqrt ( z ) + z + z ^ ( 3 / 2 ) ) , z , n ) ; |
\[\tag{%o8} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{n+1}}}{n+1}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{\frac{n+1}{2}}}}{n+1}\right.}\]
(%i9) | FPS ( sin ( z ) / z ^ 5 + sqrt ( 1 + z ) + 1 / sqrt ( 1 + z ) , z , n ) ; |
\[\tag{%o9} \left( \sum_{n=0}^{\infty }{\left. -\frac{{{\left( -1\right) }^{n}}\, \left( 2 n-1\right) \operatorname{!} \left( \left( 2 n+1\right) \operatorname{!}-3 \left( 2 n\right) \operatorname{!}\right) \, {{z}^{n}}}{{{4}^{n}}\, {{n\operatorname{!}}^{2}}\, \left( \left( 2 n-1\right) \operatorname{!}-\left( 2 n\right) \operatorname{!}\right) }\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{2 \left( n-2\right) }}}{\left( 2 n+1\right) \operatorname{!}}\right.}\]
2 Hypergeometric type power series
(%i10) | FPS ( asin ( z ) ^ 2 , z , n ) ; |
\[\tag{%o10} \sum_{n=0}^{\infty }{\left. \frac{{{4}^{n}}\, {{n\operatorname{!}}^{2}}\, {{z}^{2 \left( n+1\right) }}}{\left( n+1\right) \, \left( 2 n+1\right) \operatorname{!}}\right.}\]
(%i11) | FPS ( atan ( z ^ 2 ) , z , n ) ; |
\[\tag{%o11} \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{2 \left( 2 n+1\right) }}}{2 n+1}\right.}\]
(%i12) | FPS ( exp ( asinh ( z ) ) , z , n ) ; |
\[\tag{%o12} \frac{\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, \left( 2 n\right) \operatorname{!} {{z}^{2 \left( n+1\right) }}}{\left( n+1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}}{2}+z+1\]
(%i13) | FPS ( integrate ( erf ( t ) , t , 0 , z ) , z , n ) ; |
\[\tag{%o13} -\frac{\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{2 n}}}{\left( 2 n-1\right) n\operatorname{!}}\right.}}{\sqrt{\ensuremath{\pi} }}\]
(%i14) | FPS ( exp ( z ) − 2 · exp ( − z / 2 ) · cos ( sqrt ( 3 ) · z / 2 + %pi / 3 ) , z , n ) ; |
\[\tag{%o14} 3 \sum_{n=0}^{\infty }{\left. \frac{{{z}^{3 n+1}}}{{{\left( \frac{2}{3}\right) }_n}\, {{\left( \frac{4}{3}\right) }_n}\, {{27}^{n}} n\operatorname{!}}\right.}\]
(%i15) | FPS ( z · atan ( z ) − log ( 1 + z ^ 2 ) / 2 , z , n ) ; |
\[\tag{%o15} \frac{\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{2 \left( n+1\right) }}}{\left( n+1\right) \, \left( 2 n+1\right) }\right.}}{2}\]
(%i16) | declare ( k , constant ) $ |
(%i17) | FPS ( z ^ 2 / ( 1 − z ) ^ k , z , n ) ; |
\[\tag{%o17} \sum_{n=0}^{\infty }{\left. \frac{{{(k)}_n}\, {{z}^{n+2}}}{n\operatorname{!}}\right.}\]
(%i18) | FPS ( z ^ 3 · ( cos ( k · z ) + sin ( k · z ) ) , z , n ) ; |
\[\tag{%o18} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left| k\right| }^{2 n}}\, {{\left( -1\right) }^{n}}\, {{z}^{2 n+3}}}{\left( 2 n\right) \operatorname{!}}\right.}\right) +k\, \sum_{n=0}^{\infty }{\left. \frac{{{\left| k\right| }^{2 n}}\, {{\left( -1\right) }^{n}}\, {{z}^{2 \left( n+2\right) }}}{\left( 2 n+1\right) \operatorname{!}}\right.}\]
(%i19) | FPS ( exp ( z ) · cos ( z ) , z , n ) ; |
\[\tag{%o19} \left( \sum_{n=0}^{\infty }{\left. -\frac{{{\left( -1\right) }^{n}}\, {{4}^{n}}\, {{z}^{4 n+3}}}{{{\left( \frac{1}{4}\right) }_n}\, {{\left( \frac{3}{4}\right) }_n}\, \left( 2 n+1\right) \, \left( 4 n+1\right) \, \left( 4 n+3\right) \, {{64}^{n}}\, \left( 2 n\right) \operatorname{!}}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{4}^{n}}\, {{z}^{4 n+1}}}{{{\left( \frac{1}{4}\right) }_n}\, {{\left( \frac{3}{4}\right) }_n}\, \left( 4 n+1\right) \, {{64}^{n}}\, \left( 2 n\right) \operatorname{!}}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{4}^{n}}\, {{z}^{4 n}}}{{{\left( \frac{1}{4}\right) }_n}\, {{\left( \frac{3}{4}\right) }_n}\, {{64}^{n}}\, \left( 2 n\right) \operatorname{!}}\right.}\]
(%i20) | FPS ( sin ( z ) + z · cos ( z ) , z , n ) ; |
\[\tag{%o20} \sum_{n=0}^{\infty }{\left. \frac{2 \left( n+1\right) \, {{\left( -1\right) }^{n}}\, {{z}^{2 n+1}}}{\left( 2 n+1\right) \, \left( 2 n\right) \operatorname{!}}\right.}\]
(%i21) |
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+ 5 / 12 · x ^ 2 + 1 / 4 , x , n ) ; |
\[\tag{%o21} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{x}^{2 \left( n+2\right) }}}{4 \left( n+1\right) \, \left( n+2\right) \, \left( 2 n+1\right) \, \left( 2 n+3\right) }\right.}\right) +\frac{1}{4}\]
(%i22) | declare ( q1 , constant , q2 , constant ) $ |
(%i23) | FPS ( 1 / ( q1 − z ^ 2 ) / ( q2 − z ^ 3 ) , z , n ) ; |
\[\tag{%o23} \left( \sum_{n=0}^{\infty }{\left. -\frac{\mathit{q1}\, {{\mathit{q2}}^{-n-1}}\, {{z}^{3 n+2}}}{{{\mathit{q2}}^{2}}-{{\mathit{q1}}^{3}}}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. -\frac{{{z}^{3 n+1}}}{\left( {{\mathit{q2}}^{2}}-{{\mathit{q1}}^{3}}\right) \, {{\mathit{q2}}^{n}}}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. \frac{{{z}^{2 n+1}}}{\left( {{\mathit{q2}}^{2}}-{{\mathit{q1}}^{3}}\right) \, {{\mathit{q1}}^{n}}}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. -\frac{{{\mathit{q1}}^{2}}\, {{\mathit{q2}}^{-n-1}}\, {{z}^{3 n}}}{{{\mathit{q2}}^{2}}-{{\mathit{q1}}^{3}}}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{\mathit{q2}\, {{\mathit{q1}}^{-n-1}}\, {{z}^{2 n}}}{{{\mathit{q2}}^{2}}-{{\mathit{q1}}^{3}}}\right.}\]
(%i24) | FPS ( tan ( 3 · atan ( z ^ 2 ) ) , z , n ) ; |
\[\tag{%o24} \left( \sum_{n=0}^{\infty }{\left. 8 {{3}^{n-1}}\, {{z}^{4 n+2}}\right.}\right) +\frac{{{z}^{2}}}{3}\]
(%i25) | FPS ( ( sin ( z ) + cos ( z ) ) ^ 3 , z , n ) ; |
\[\tag{%o25} \left( \sum_{n=0}^{\infty }{\left. \frac{3 \left( {{\left( -1\right) }^{n}}+{{\left( -9\right) }^{n}}\right) \, {{z}^{2 n+1}}}{2 \left( 2 n+1\right) \, \left( 2 n\right) \operatorname{!}}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{\left( 3 {{\left( -1\right) }^{n}}-{{\left( -9\right) }^{n}}\right) \, {{z}^{2 n}}}{2 \left( 2 n\right) \operatorname{!}}\right.}\]
(%i26) | FPS ( atan ( z ) + asin ( z ) , z , n ) ; |
\[\tag{%o26} \sum_{n=0}^{\infty }{\left. \frac{\left( \left( 2 n\right) \operatorname{!}+{{\left( -1\right) }^{n}}\, {{4}^{n}}\, {{n\operatorname{!}}^{2}}\right) \, {{z}^{2 n+1}}}{\left( 2 n+1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\]
(%i27) | FPS ( cos ( z ) ^ 3 + log ( 1 + z ^ 2 ) , z , n ) ; |
\[\tag{%o27} \left( \sum_{n=0}^{\infty }{\left. \frac{\left( 4 {{\left( -1\right) }^{n}}\, \left( 2 \left( n+1\right) \right) \operatorname{!}+n\, {{\left( -9\right) }^{n+1}}+{{\left( -9\right) }^{n+1}}-3 n\, {{\left( -1\right) }^{n}}-3 {{\left( -1\right) }^{n}}\right) \, {{z}^{2 \left( n+1\right) }}}{4 \left( n+1\right) \, \left( 2 \left( n+1\right) \right) \operatorname{!}}\right.}\right) +1\]
(%i28) | FPS ( log ( 1 + z + z ^ 2 + z ^ 3 ) + sqrt ( 1 + z ^ 3 ) , z , n ) ; |
\[\tag{%o28} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{2 \left( n+1\right) }}}{n+1}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{n+1}}}{n+1}\right.}\right) +\sum_{n=0}^{\infty }{\left. -\frac{{{\left( -1\right) }^{n}}\, \left( 2 n\right) \operatorname{!} {{z}^{3 n}}}{\left( 2 n-1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\]
(%i29) | FPS ( exp ( z ^ 2 ) + sinh ( z ) + atan ( z ^ 2 ) , z , n ) ; |
\[\tag{%o29} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{4 n+2}}}{2 n+1}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. \frac{{{z}^{2 n+1}}}{\left( 2 n+1\right) \, \left( 2 n\right) \operatorname{!}}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{z}^{2 n}}}{n\operatorname{!}}\right.}\]
(%i30) | FPS ( atan ( z / ( 1 + z ^ 2 ) ) , z , n ) ; |
\[\tag{%o30} \sum_{n=0}^{\infty }{\left. \frac{\left( \frac{\sqrt{5}\, {{\left( \sqrt{5}+3\right) }^{n}}\, {{\left( -1\right) }^{n}}}{{{2}^{n}}}+\frac{{{\left( \sqrt{5}+3\right) }^{n}}\, {{\left( -1\right) }^{n}}}{{{2}^{n}}}-\frac{{{\left( \sqrt{5}-3\right) }^{n}}\, \sqrt{5}}{{{2}^{n}}}+\frac{{{\left( \sqrt{5}-3\right) }^{n}}}{{{2}^{n}}}\right) \, {{z}^{2 n+1}}}{2 \left( 2 n+1\right) }\right.}\]
(%i31) | Nmax : 11 $ |
(%i32) | FPS ( ( exp ( z ) − sin ( z ) ) ^ 3 , z , n ) ; |
\[\tag{%o32} \left( \sum_{n=0}^{\infty }{\left. \frac{3 \left( {{\left( -9\right) }^{n+1}}+{{\left( -1\right) }^{n}}\right) \, {{z}^{2 \left( n+1\right) +1}}}{8 \left( n+1\right) \, \left( 2 n+1\right) \, \left( 2 n+3\right) \, \left( 2 n\right) \operatorname{!}}\right.}\right) +\sum_{n=0}^{\infty }{\left. -\frac{\left( 3 {{5}^{\frac{n}{2}}} \cos{\left( \operatorname{atan}(2) n\right) }+6 {{5}^{\frac{n}{2}}} \sin{\left( \operatorname{atan}\left( \frac{1}{2}\right) n\right) }-2 {{3}^{n}}-3\right) \, {{z}^{n}}}{2 n\operatorname{!}}\right.}\]
2.1 Detecting identities
(%i33) | FPS ( asin ( z ) + acos ( z ) , z , n ) ; |
\[\tag{%o33} \frac{\ensuremath{\pi} }{2}\]
(%i34) | FPS ( cos ( 4 · acos ( z ) ) , z , n ) ; |
\[\tag{%o34} 8 {{z}^{4}}-8 {{z}^{2}}+1\]
(%i35) | FPS ( sin ( 2 · asin ( z ) ) + cos ( 3 · acos ( z ) ) , z , n ) ; |
\[\tag{%o35} \left( \sum_{n=0}^{\infty }{\left. -\frac{2 \left( 2 n\right) \operatorname{!} {{z}^{2 n+1}}}{\left( 2 n-1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\right) +4 {{z}^{3}}-3 z\]
(%i36) | FPS ( cos ( 2 · z ) − cos ( z ) ^ 2 + sin ( z ) ^ 2 , z , n ) ; |
\[\tag{%o36} 0\]
(%i37) | f : atan ( ( z + z ^ 2 ) / ( 1 − z ^ 3 ) ) ; |
\[\tag{%o37} \operatorname{atan}\left( \frac{{{z}^{2}}+z}{1-{{z}^{3}}}\right) \]
(%i38) | FPS ( f , z , n ) ; |
\[\tag{%o38} \left( \sum_{n=0}^{\infty }{\left. \frac{\sin{\left( \frac{\ensuremath{\pi} \left( n+1\right) }{2}\right) } {{z}^{2 \left( n+1\right) }}}{n+1}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{\sin{\left( \frac{\ensuremath{\pi} \left( n+1\right) }{2}\right) } {{z}^{n+1}}}{n+1}\right.}\]
(%i39) | g : atan ( z ) + atan ( z ^ 2 ) ; |
\[\tag{%o39} \operatorname{atan}\left( {{z}^{2}}\right) +\operatorname{atan}(z)\]
(%i40) | FPS ( g , z , n ) ; |
\[\tag{%o40} \left( \sum_{n=0}^{\infty }{\left. \frac{\sin{\left( \frac{\ensuremath{\pi} \left( n+1\right) }{2}\right) } {{z}^{2 \left( n+1\right) }}}{n+1}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{\sin{\left( \frac{\ensuremath{\pi} \left( n+1\right) }{2}\right) } {{z}^{n+1}}}{n+1}\right.}\]
(%i41) | FPS ( f − g , z , n ) ; |
\[\tag{%o41} 0\]
(%i42) | declare ( y , constant ) $ |
(%i43) | FPS ( atan ( ( z + y ) / ( 1 − z · y ) ) , z , n ) ; |
\[\tag{%o43} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{2 n+1}}}{2 n+1}\right.}\right) +\operatorname{atan}(y)\]
(%i44) | f : sqrt ( ( 1 − sqrt ( 1 − z ) ) / z ) ; |
\[\tag{%o44} \frac{\sqrt{1-\sqrt{1-z}}}{\sqrt{z}}\]
(%i45) | FPS ( f , z , n ) ; |
\[\tag{%o45} \frac{\sum_{n=0}^{\infty }{\left. \frac{{{\left( \frac{1}{4}\right) }_n}\, {{\left( \frac{3}{4}\right) }_n}\, {{4}^{n}}\, {{z}^{n}}}{\left( 2 n+1\right) \operatorname{!}}\right.}}{\sqrt{2}}\]
(%i46) | g : ( sqrt ( 1 + sqrt ( z ) ) − sqrt ( 1 − sqrt ( z ) ) ) / ( sqrt ( 2 · z ) ) ; |
\[\tag{%o46} \frac{\sqrt{\sqrt{z}+1}-\sqrt{1-\sqrt{z}}}{\sqrt{2}\, \sqrt{z}}\]
(%i47) | FPS ( g , z , n ) ; |
\[\tag{%o47} \frac{\sum_{n=0}^{\infty }{\left. \frac{{{\left( \frac{1}{4}\right) }_n}\, {{\left( \frac{3}{4}\right) }_n}\, {{4}^{n}}\, {{z}^{n}}}{\left( 2 n+1\right) \operatorname{!}}\right.}}{\sqrt{2}}\]
(%i48) | FPS ( f − g , z , n ) ; |
\[\tag{%o48} 0\]
2.2 Some Puiseux series (series with fractional powers)
(%i49) | FPS ( asin ( z ^ ( 1 / 3 ) ) , z , n ) ; |
\[\tag{%o49} \sum_{n=0}^{\infty }{\left. \frac{\left( 2 n\right) \operatorname{!} {{z}^{\frac{2 n+1}{3}}}}{\left( 2 n+1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\]
(%i50) | FPS ( log ( 1 + z ^ ( 1 / 5 ) ) , z , n ) ; |
\[\tag{%o50} \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{\frac{n+1}{5}}}}{n+1}\right.}\]
(%i51) | FPS ( 1 / ( 1 − z ^ ( 1 / 7 ) ) , z , n ) ; |
\[\tag{%o51} \sum_{n=0}^{\infty }{\left. {{z}^{\frac{n}{7}}}\right.}\]
(%i52) | FPS ( cos ( sqrt ( z ) ) + sin ( z ^ ( 3 / 4 ) ) , z , n ) ; |
\[\tag{%o52} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{\frac{6 n+3}{4}}}}{\left( 2 n+1\right) \, \left( 2 n\right) \operatorname{!}}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{n}}}{\left( 2 n\right) \operatorname{!}}\right.}\]
(%i53) | FPS ( atan ( sqrt ( z ) ) + asinh ( z ^ ( 1 / 3 ) ) , z , n ) ; |
\[\tag{%o53} \left( \sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{\frac{6 n+3}{6}}}}{2 n+1}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, \left( 2 n\right) \operatorname{!} {{z}^{\frac{4 n+2}{6}}}}{\left( 2 n+1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\]
(%i54) | FPS ( sqrt ( sqrt ( 8 · z ^ 3 + 1 ) − 1 ) + sqrt ( 13 · z ^ 4 + 7 ) , z , n ) ; |
\[\tag{%o54} \left( \sum_{n=0}^{\infty }{\left. \frac{2 {{\left( \frac{1}{4}\right) }_n}\, {{\left( \frac{3}{4}\right) }_n}\, {{\left( -8\right) }^{n}}\, {{4}^{n}}\, {{z}^{\frac{6 n+3}{2}}}}{\left( 2 n+1\right) \, \left( 2 n\right) \operatorname{!}}\right.}\right) +\sum_{n=0}^{\infty }{\left. -\frac{{{7}^{\frac{1}{2}-n}}\, {{\left( -13\right) }^{n}}\, \left( 2 n\right) \operatorname{!} {{z}^{4 n}}}{\left( 2 n-1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\]
(%i55) | FPS ( asin ( z ^ ( 1 / 3 ) ) + log ( 1 + z ^ ( 1 / 5 ) ) , z , n ) ; |
\[\tag{%o55} \left( \sum_{n=0}^{\infty }{\left. \frac{\left( 2 n\right) \operatorname{!} {{z}^{\frac{10 n+5}{15}}}}{\left( 2 n+1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. \frac{3 {{\left( -1\right) }^{n}}\, {{z}^{\frac{3 n+2}{15}}}}{3 n+2}\right.}\right) +\left( \sum_{n=0}^{\infty }{\left. -\frac{3 {{\left( -1\right) }^{n}}\, {{z}^{\frac{3 n+1}{15}}}}{3 n+1}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{3 {{\left( -1\right) }^{n}}\, {{z}^{\frac{n+1}{15}}}}{n+1}\right.}\]
(%i56) | map ( lambda ( [ f ] , FPS ( f , z , n ) ) , asin ( z ^ ( 1 / 3 ) ) + log ( 1 + z ^ ( 1 / 5 ) ) ) ; |
\[\tag{%o56} \left( \sum_{n=0}^{\infty }{\left. \frac{\left( 2 n\right) \operatorname{!} {{z}^{\frac{2 n+1}{3}}}}{\left( 2 n+1\right) \, {{4}^{n}}\, {{n\operatorname{!}}^{2}}}\right.}\right) +\sum_{n=0}^{\infty }{\left. \frac{{{\left( -1\right) }^{n}}\, {{z}^{\frac{n+1}{5}}}}{n+1}\right.}\]
2.3 Series related to hypergeometric type series
(%i57) | FPS ( 1 / ( exp ( z ) − 1 ) , z , n ) ; |
\[\tag{%o57} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{n}}\right.}\operatorname{,}{A_n}=\sum_{k=1}^{n}{\left. -\frac{{A_{n-k}}}{k\operatorname{!}}\right.}\operatorname{,}{A_0}=1]\]
(%i58) | FPS ( exp ( z ) · log ( 1 + z ) , z , n ) ; |
\[\tag{%o58} \sum_{n=0}^{\infty }{\left. \left( \sum_{k=0}^{n}{\left. \frac{{{\left( -1\right) }^{n-k}}}{k\operatorname{!} \left( n-k+1\right) }\right.}\right) \, {{z}^{n+1}}\right.}\]
(%i59) | FPS ( log ( 1 + z ) / exp ( z ) , z , n ) ; |
\[\tag{%o59} \sum_{n=0}^{\infty }{\left. {{\left( -1\right) }^{n}}\, \left( \sum_{k=0}^{n}{\left. \frac{1}{k\operatorname{!} \left( n-k+1\right) }\right.}\right) \, {{z}^{n+1}}\right.}\]
(%i60) | FPS ( tan ( z ) , z , n ) ; |
\[\tag{%o60} [\sum_{n=0}^{\infty }{\left. \left( \sum_{k=0}^{n}{\left. \frac{{A_k}\, {{\left( -1\right) }^{n-k}}}{\left( 2 n-2 k+1\right) \operatorname{!}}\right.}\right) \, {{z}^{2 n+1}}\right.}\operatorname{,}{A_k}=\sum_{j=1}^{k}{\left. -\frac{{A_{k-j}}\, {{\left( -1\right) }^{j}}}{\left( 2 j\right) \operatorname{!}}\right.}\operatorname{,}{A_0}=1]\]
(%i61) | FPS ( 1 / atan ( z ) , z , n ) ; |
\[\tag{%o61} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{2 n-1}}\right.}\operatorname{,}{A_n}=\sum_{k=1}^{n}{\left. -\frac{{{\left( -1\right) }^{k}}\, {A_{n-k}}}{2 k+1}\right.}\operatorname{,}{A_0}=1]\]
(%i62) | FPS ( atan ( z ) · sin ( z ) , z , n ) ; |
\[\tag{%o62} \sum_{n=0}^{\infty }{\left. {{\left( -1\right) }^{n}}\, \left( \sum_{k=0}^{n}{\left. \frac{1}{\left( 2 k+1\right) \, \left( 2 n-2 k+1\right) \operatorname{!}}\right.}\right) \, {{z}^{2 n+2}}\right.}\]
(%i63) | FPS ( atan ( z ) ^ 2 , z , n ) ; |
\[\tag{%o63} \sum_{n=0}^{\infty }{\left. {{\left( -1\right) }^{n}}\, \left( \sum_{k=0}^{n}{\left. \frac{1}{\left( 2 k+1\right) \, \left( 2 n-2 k+1\right) }\right.}\right) \, {{z}^{2 n+2}}\right.}\]
2.4 Recursive representations from recurrence equations
(%i64) | FPS ( exp ( z + z ^ 2 ) , z , n ) ; |
\[\tag{%o64} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{n}}\right.}\operatorname{,}{A_{n+2}}=\frac{{A_{n+1}}+2 {A_n}}{n+2}\operatorname{,}n\operatorname{> =}0\operatorname{,}[{A_0}=1\operatorname{,}{A_1}=1]]\]
(%i65) | FPS ( sin ( 1 + z + z ^ 2 ) , z , n ) ; |
\[\tag{%o65} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{n}}\right.}\operatorname{,}{A_{n+5}}=\frac{-2 \left( n+2\right) \, \left( n+4\right) \, {A_{n+4}}-{A_{n+3}}-6 {A_{n+2}}-12 {A_{n+1}}-8 {A_n}}{\left( n+4\right) \, \left( n+5\right) }\operatorname{,}n\operatorname{> =}0\operatorname{,}[{A_0}=\sin{(1)}\operatorname{,}{A_1}=\cos{(1)}\operatorname{,}{A_2}=-\frac{\sin{(1)}-2 \cos{(1)}}{2}\operatorname{,}{A_3}=-\frac{6 \sin{(1)}+\cos{(1)}}{6}\operatorname{,}{A_4}=-\frac{11 \sin{(1)}+12 \cos{(1)}}{24}]]\]
(%i66) | FPS ( atan ( z ) · exp ( z ) , z , n ) ; |
\[\tag{%o66} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{n}}\right.}\operatorname{,}{A_{n+4}}=\frac{2 \left( n+3\right) \, {A_{n+3}}-\left( {{\left( n+2\right) }^{2}}+n+3\right) \, {A_{n+2}}+2 \left( n+2\right) \, {A_{n+1}}-{A_n}}{\left( n+3\right) \, \left( n+4\right) }\operatorname{,}n\operatorname{> =}0\operatorname{,}[{A_0}=0\operatorname{,}{A_1}=1\operatorname{,}{A_2}=1\operatorname{,}{A_3}=\frac{1}{6}]]\]
(%i67) | Taylor ( sin ( z ) , z , 0 , 7 ) ; |
\[\tag{%o67} -\frac{{{z}^{7}}}{5040}+\frac{{{z}^{5}}}{120}-\frac{{{z}^{3}}}{6}+z\]
(%i68) | Taylor ( atan ( z ) ^ 2 , z , 0 , 10 ) ; |
\[\tag{%o68} \frac{563 {{z}^{10}}}{1575}-\frac{44 {{z}^{8}}}{105}+\frac{23 {{z}^{6}}}{45}-\frac{2 {{z}^{4}}}{3}+{{z}^{2}}\]
(%i69) | taylor ( atan ( z ) ^ 2 , z , 0 , 10 ) ; |
\[\tag{%o69)/T} {{z}^{2}}-\frac{2 {{z}^{4}}}{3}+\frac{23 {{z}^{6}}}{45}-\frac{44 {{z}^{8}}}{105}+\frac{563 {{z}^{10}}}{1575}+\operatorname{...}\]
(%i70) | showtime : true $ |
\[Evaluation took 0.0000 seconds (0.0000 elapsed) using 0 bytes.\]
(%i71) | Taylor ( atan ( z ) ^ 2 , z , 0 , 1000 ) $ |
\[Evaluation took 0.5000 seconds (0.4960 elapsed) using 385.396 MB.\]
(%i72) | taylor ( atan ( z ) ^ 2 , z , 0 , 1000 ) $ |
\[Evaluation took 7.2810 seconds (7.2760 elapsed) using 1248.234 MB.\]
(%i73) | showtime : false $ |
3 Non-holonomic power series
(%i74) | FPS ( log ( 1 + sin ( z ) ) , z , n ) ; |
\[\tag{%o74} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{n}}\right.}\operatorname{,}{A_{n+4}}=\frac{-\left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, \left( k+2\right) \, {A_{k+2}}\, \left( n-k+2\right) \, {A_{n-k+2}}\right.}\right) -\left( n+2\right) \, \left( n+3\right) \, {A_{n+3}}+\left( n+2\right) \, {A_{n+2}}}{\left( n+2\right) \, \left( n+3\right) \, \left( n+4\right) }\operatorname{,}n\operatorname{> =}0\operatorname{,}[{A_0}=0\operatorname{,}{A_1}=1\operatorname{,}{A_2}=-\frac{1}{2}\operatorname{,}{A_3}=\frac{1}{6}]]\]
(%i75) | f : ( 1 + tan ( z ) ) / ( 1 − tan ( z ) ) ; |
\[\tag{%o75} \frac{\tan{(z)}+1}{1-\tan{(z)}}\]
(%i76) | FPS ( f , z , n ) ; |
\[\tag{%o76} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{n}}\right.}\operatorname{,}{A_{n+3}}=\frac{2 \left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, {A_{k+1}}\, {A_{n-k+1}}\right.}\right) +2 \left( n+2\right) \, {A_{n+2}}+4 {A_{n+1}}}{\left( n+2\right) \, \left( n+3\right) }\operatorname{,}n\operatorname{> =}0\operatorname{,}[{A_0}=1\operatorname{,}{A_1}=2\operatorname{,}{A_2}=2]]\]
(%i77) | g : exp ( 2 · atanh ( sin ( 2 · z ) / ( 1 + cos ( 2 · z ) ) ) ) ; |
\[\tag{%o77} {{\% e}^{2 \operatorname{atanh}\left( \frac{\sin{\left( 2 z\right) }}{\cos{\left( 2 z\right) }+1}\right) }}\]
(%i78) | FPS ( g , z , n ) ; |
\[\tag{%o78} [\sum_{n=0}^{\infty }{\left. {A_n}\, {{z}^{n}}\right.}\operatorname{,}{A_{n+4}}=\frac{3 \left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, \left( k+2\right) \, {A_{k+2}}\, \left( n-k+2\right) \, {A_{n-k+2}}\right.}\right) -\left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, \left( k+2\right) \, \left( k+3\right) \, {A_{k+3}}\, {A_{n-k+1}}\right.}\right) -4 \left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, {A_{k+1}}\, {A_{n-k+1}}\right.}\right) +6 \left( n+2\right) \, \left( n+3\right) \, {A_{n+3}}+8 \left( n+2\right) \, {A_{n+2}}-24 {A_{n+1}}}{\left( n+2\right) \, \left( n+3\right) \, \left( n+4\right) }\left( 3 \left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, \left( k+2\right) \, {A_{k+2}}\, \left( n-k+2\right) \, {A_{n-k+2}}\right.}\right) -\left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, \left( k+2\right) \, \left( k+3\right) \, {A_{k+3}}\, {A_{n-k+1}}\right.}\right) -4 \left( \sum_{k=1}^{n}{\left. \left( k+1\right) \, {A_{k+1}}\, {A_{n-k+1}}\right.}\right) +6 \left( n+2\right) \, \left( n+3\right) \, {A_{n+3}}+8 \left( n+2\right) \, {A_{n+2}}-24 {A_{n+1}}\right) /\left( \left( n+2\right) \, \left( n+3\right) \, \left( n+4\right) \right) \operatorname{,}n\operatorname{> =}0\operatorname{,}[{A_0}=1\operatorname{,}{A_1}=2\operatorname{,}{A_2}=2\operatorname{,}{A_3}=\frac{8}{3}]]\]
(%i79) | FPS ( f − g , z , n ) ; |
\[\tag{%o79} 0\]
4 Conclusion
Created with wxMaxima.
Bertrand Teguia Tabuguia
February 2021