Talk:Formal power series: Difference between revisions
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(ask for mult/div info) |
(About solving equations) |
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==Multiplication and division== |
==Multiplication and division== |
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Could someone post examples of correct multiplication and division of power series, and perhaps even an explanation of the correct algorithm? The Haskell code is invalid, and I just wrote a translation of the D/Java code, which gives wrong results: multiplying 2 by 1 yields 3 + 3x + 3x^2 + ... --[[User:Kevin Reid|Kevin Reid]] 00:04, 17 February 2009 (UTC) |
Could someone post examples of correct multiplication and division of power series, and perhaps even an explanation of the correct algorithm? The Haskell code is invalid, and I just wrote a translation of the D/Java code, which gives wrong results: multiplying 2 by 1 yields 3 + 3x + 3x^2 + ... --[[User:Kevin Reid|Kevin Reid]] 00:04, 17 February 2009 (UTC) |
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==About solving equations== |
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The task seems incomplete without defining cos as: |
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cos''x'' = -d<sup>2</sup>/d''x''<sup>2</sup> cos''x'' |
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assuming that d/d''x'' denotes the differential operator. The task uses the integral operator instead and sin''x'' as a temporal. Shouldn't it work with '''any''' operator defined defined in the task, in any combination of? --[[User:Dmitry-kazakov|Dmitry-kazakov]] 10:32, 17 February 2009 (UTC) |
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