3 events
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Nov 3 '17 at 2:06 comment added spektr @nosuchthingasstars nope. Those unit vectors are tied to the fact your sample PDEs only have spatial derivatives in the variable $x$, which is in the first unit direction.
Nov 3 '17 at 0:36 comment added emprice Quick clarification -- should one of those unit vectors be $\hat{e}_2$? Or are both $\hat{e}_1$?
Nov 2 '17 at 17:09 history answered spektr CC BY-SA 3.0