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[✓] Indicate to W|A that variables are dependent, rather than independent?

Posted 1 year ago
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I have seen that the Mathematica product can do this, but I've yet to figure out how to indicate to W|A that variables are dependent, rather than independent. I know that the product can do this, because equations such as finding d/dx of $$xe^x=ye^x$$ produce correct answers ... following along in the solutions. But if I take this result, properly reduced, d/dx of $$\frac{y(x-1)}{x(y-1)}$$ it assumes that the variables are independent. I've tried all sorts of notation without finding a method to instruct to W|A that x and y are dependent variables. Thank you for any answers to my question. BTW I am a paying member of W|A. :-)

5 Replies
Posted 1 year ago

Can you use this

Dt[y(x-1)/(x(y-1)),x]

to help you get closer to where you want to go?

WA link

Posted 1 year ago
Posted 1 year ago

That doesn't always work, but sometimes it can solve a problem that you can't find any other solution to

Posted 1 year ago

Yes, thank you! Strange that I could not find this under the PD examples or similar. But that did exactly work for me! I've been wrestling about this subject for quite a while. :-) Is there a website area where this syntax is explained?

Posted 1 year ago

Thank you very much. In all my years of using W|A I was never aware that you could make Mathematica or Mathematica-like calls directly. Great news! :-)

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