First Order Partial Differential Equations, Part - 1: Single …
Symbols for various domains used In this lecture we denote by Da domain in R2 where a solution is de ned, by D 1 a domain in R2 where the coe cients of a linear equation are de ned and by D 2 is a domain in(x;y;u)-space i.e., R3 nally by D 3 a domain in R5 where the function F of ve independent variables is de ned.
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