If, lim [(A)/2^y] as y->infinity = (1/2)*[(1/2)^x], what is A(x)?

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SUMMARY

The limit expression lim [A(x,y)/2^y] as y approaches infinity equals (1/2)*[(1/2)^x]. To satisfy this condition, A(x,y) must be defined as A(x,y) = C(x)D(y), where D(y) is specifically chosen as 2^y. This formulation ensures that as y approaches infinity, the term D(y) cancels the denominator, leading to the conclusion that A(x,y) must depend on y for values less than infinity.

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If

lim [A(x,y)/2^y] as y->infinity = (1/2)*[(1/2)^x] ,

What is A(x,y)?
 
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You would want to have a term that cancels out the denominator. For example take A(x,y)=C(x)D(y), if we then take D(y)=2^y [itex]\lim_{y \to \infty}A(x,y)/2^y=\lim_{y \to \infty}C(x)=C(x)[/itex].
 
A(x,y) must not be y independent for y<infinity.
 

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