For anyone interested, I think the proof follows along the lines, for any fixed h, the function is continuous and goes to 0 as x goes to plus or minus infinity, thus it is bounded by say M, hence we have,
simple when u know how I guess!
For anyone interested, I think the proof follows along the lines, for any fixed h, the function is continuous and goes to 0 as x goes to plus or minus infinity, thus it is bounded by say M, hence we have,
simple when u know how I guess!