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Alexander Bogner

Power series in two variables with Wolfram Alpha Pro for Students

Alexander Bogner
Posted 10 years ago
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Hello,
I'm trying to proof my Taylor Series with Wolfram Alpha but it won't let me do an correct input.
The function is: exp(y*x^2)*ln(y*x +1)
and I want to get the taylor polynom in x0=0 and y0=1 but i do not get it work for both variables.
My Input was:
Series[exp(y*x^2)*ln(y*x +1), {x, 0, 2}, {y, 1, 2}]
For one variable it's no problem and everything works like a charm but when i try to add the second variable it doesn't work. I really don't know what I'm doing wrong.
Please help me.
POSTED BY: Alexander Bogner
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The input
Series[Exp[y*x^2]*Log[y*x + 1], {x, 0, 4}, {y, 1, 4}]
is not resolved by WolframAlpha: Wolfram|Alpha doesn't understand your query;similiar inputs became also not resolved. The examples show only 1 variable https://www.wolframalpha.com/examples/SeriesExpansions.html: no chance for a taylor series in two variables in WolframAlpha seemingly (possibly allowed if one goes "Pro"). 
POSTED BY: Udo Krause
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