- #1
trap101
- 342
- 0
Let:
gn(x) = 1 in [1/4 - 1/n2 to 1/4 + 1/ n2) for n = odd
1 in [3/4-1/n2 to 3/4 + 1/n2) for n = even
0 elsewhere
Show the function converges in the L2 sense but not pointwise.
My issue is in how I should use the definition of convergence because in all of the definitions of convergence between uniform, L2 and pointwise they all follow the similar rule of:
|f(x) - Ʃfn(x)| --> 0
I am having issues in determining my f(x) for the difference because fn(x) will be 1 depending on "n" being odd or even, so what would my exact value of f(x) be even though I am comparing the whole function?
gn(x) = 1 in [1/4 - 1/n2 to 1/4 + 1/ n2) for n = odd
1 in [3/4-1/n2 to 3/4 + 1/n2) for n = even
0 elsewhere
Show the function converges in the L2 sense but not pointwise.
My issue is in how I should use the definition of convergence because in all of the definitions of convergence between uniform, L2 and pointwise they all follow the similar rule of:
|f(x) - Ʃfn(x)| --> 0
I am having issues in determining my f(x) for the difference because fn(x) will be 1 depending on "n" being odd or even, so what would my exact value of f(x) be even though I am comparing the whole function?