c**********e
发帖数: 2007 | 1 I have a PDE (heat equation)
{partial u} / {partial t} = {partial ^2 u} / {partial y ^2}
Now I want to change of variable by y = x + a*t, where a is a constant. In the new PDE, I do not want y, but want to have x. What is the result? | x******a
发帖数: 6336 | | c**********e
发帖数: 2007 | 3 at is a*t. i.e. means in other words. I have revised it to avoid
misunderstanding.
【在 x******a 的大作中提到】
: What is at le?
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