Recent content by BaitiTamam

>lurflurf I got it. Changing variable was out of my thought. Thank you:)

Let ρ(x) be a continuous function on ℝ, which evaluates ρ(x)=0 when |x|≥1 and that meets following. ∫[-1,1]ρ(x)dx=1 And let ψ(x) be a continuous function on interval [-1,1], prove lim[n→∞] n∫[-1,1]ρ(nx)ψ(x)dx = ψ(0). is denoted. This is NOT a homework but a past exam problem of...

>voko with your denotation, I found that u''=-u+(\phi '\psi-\psi '\phi)f conveys the 1st differencial of \phi '\psi-\psi '\phiequals to 0 leads its constancy. Thank you!

hello everyone! I had a stuck in solving problem for a week now, so need help. Please help! the problem is as follows.In a closed interval I=[0,\pi], the 2-times continuously differentiable function \phi(x) and \psi(x) meet the following conditions (they're ranged in \mathbb{R}). \psi...