Mar
12
Calculus: why is 1^infinity not just 1?
Written by
smith
Why is this?
infinity by functions the limits of which are 1, 0, and infinity as
x -> 0, then the limit of the compound function does not exist, in the
sense that the limit depends on which functions you choose.
For an example of this discrepancy for 1^infinity, on the one hand,
take f(x) = 1 and g(x) = 1/x. Then:
lim f(x)^g(x) = lim 1^(1/x) = lim 1 = 1
On the other hand, if we take f(x) = 1 + x and g(x) = 1/x, then:
lim f(x)^g(x) = lim (1 + x)^(1/x) = e = 2.718281828459... > 1
make it a good day
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