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- Are ##u## and ##\mu## used interchangeably in partial differential equations?

Hi all, I am confused about symbols.

I cannot figure out why my partial differential equations professor writes ##u## and ##\mu## in his lectures. A function ##u(x, y)## turns into ##\mu(x, y)##. His homework sets are always typed with ##u##. I also think he says MYOO during the lectures so it is not just a strange way to write ##u##. He is a Frenchman.

I cannot figure out why my partial differential equations professor writes ##u## and ##\mu## in his lectures. A function ##u(x, y)## turns into ##\mu(x, y)##. His homework sets are always typed with ##u##. I also think he says MYOO during the lectures so it is not just a strange way to write ##u##. He is a Frenchman.