I am writing a thesis and I shouldn't claim credit for things I haven't done/come up with. On the other hand, math.stackexchange is a bit shady as a source and listing it as such can therefore hurt my reputation. (I don't want to claim credit, I'd just rather not list the source.) What is the proper way to approach this problem?
I have used this forum for a proof for the identity $\Delta(z)=z\Delta(z+1)$ in Weierstrass Gamma function.
Also, I have watched a tutorial on youtube to prove that Euler's constant $\gamma$ converges, which is an added bonus of sorts; it is part of an appendix. Should I cite this and if so how?