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  • $\begingroup$ What is an especially good day? Full moon? Payday? $\endgroup$ Commented Mar 17, 2013 at 23:18
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    $\begingroup$ @Rolf Mertig Any day that Alpha limit code behaves is a good day.. $\endgroup$ Commented Mar 17, 2013 at 23:23
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    $\begingroup$ +1 Nice. Interesting: fails on bivariateLimit[(x^2 + y^2)/(x^2 + y^2)] but not on bivariateLimit[(2 x^2 + 2 y^2)/(x^2 + y^2)]. The use of GroebnerBasis suggests it will only work on rational functions. $\endgroup$ Commented Mar 18, 2013 at 2:00
  • $\begingroup$ @Michael E2 See edit #2 (and I'm deleteing my comment response since that covers it). $\endgroup$ Commented Mar 18, 2013 at 2:36
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    $\begingroup$ @Jens It was a simple example. Try it with y->y^2 to see the difference. That said, bivariateLimit gets quite slow as degrees go up, much more so than that FullSimplify line. $\endgroup$ Commented Mar 23, 2013 at 23:47