n m . Let f(x) Az Ay be a Riemann sum of a function of two variables constructed over a j=1 i=1 rectangular region. Explain what each aspect of this notation represents, and explain what it means to compute a double sum like this. Is it true that n m m 72 ΣΣ 1(250) ΔεΔy = ΣΣ 1(21) ΔyΔα? j=1 i=1 1 j1 Why or why not?

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