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physdood
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Homework Statement
Given f(x,y)=(y+x)/(y-x) use an ε-∂ proof to show that lim(x,y)→(0,1) f(x,y) exists.
Homework Equations
|(y+x)/(y-x)-1|=|(2x)/(y-x)|
The Attempt at a Solution
I know that the limit is 1. I can't figure out how to massage the above any further to get it into the form |(2x)/(y-x)|<=k|x| or |(2x)/(y-x)|<=k|y-1| so that I can choose an appropriate value for ∂. I have tried restricting ∂<1 but it doesn't get me any further. Any hints would be appreciated.
Thanks.