What is the parametrization used in the $\pi = 4$ proof?
2786
The staircase paradox, or why $\pi\ne4$
83262
Why is there a factor of $4\pi$ in certain force equations?
126484
Why is $\Gamma\left(\frac{1}{2}\right)=\sqrt{\pi}$?
134687
Is there a more elegant way of proving $\langle (1,2)(3,4), (1,2,3,4,5) \rangle = A_5$
65276
Residues and poles proof
69679
Geometric interpretation for sum of fourth powers
95637
Justifying Calculations on $f(n)=\frac{1}{2 \pi}\int_{-\pi}^{\pi}\theta e^{-in \theta} d \theta$
157946
Elementary derivation of certian identites related to the Riemannian Zeta function and the Euler-Mascheroni Constant
123056
Help in understanding the proof of Mersenne Prime
83290
How is the value of $\pi$ ( Pi ) actually calculated?
77951
Dirac's delta in 3 dimensions: proof of $\nabla^2(\|\boldsymbol{x}-\boldsymbol{x}_0\|^{-1})=-4\pi\delta(\boldsymbol{x}-\boldsymbol{x}_0)$
5679
Why is $2\pi i \neq 0?$
154841
Computing symmetry/combinatorial factor for a diagram in $\phi^4$ theory
40837
Why $e^{i(π/3)} \ne -1$?
90475
Coordinate-free proof of $\operatorname{Tr}(AB)=\operatorname{Tr}(BA)$?
104548
Geometric proof for irrationality of $\pi$
113080
Prove $\tan\big(\frac{\pi}{2} -\theta \big) = \cot \theta$