I don't know if this is a terribly ignorant question but I was wondering what exactly is y(0)=1? Is that like f(0)=1 where the x is 0 and the y is 1?(adsbygoogle = window.adsbygoogle || []).push({});

I'm also curious about the expression u=f(x, y, z). What is that exactly? How is it related to the x, y, z coordinates?

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# Basic Notation Q's

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