Different ways gives different results - solving $\tan 2a = \sqrt 3 $

Darboux integrability implies Riemann integrability

Automorphism group of the projective unitary group PU(N) and SO(N)

Is the tensor product (of vector spaces) commutative?

Using the fact that $\sqrt{n}$ is an irrational number whenever $n$ is not a perfect square, show $\sqrt{3} + \sqrt{7} + \sqrt{21}$ is irrational.

Value of the structure sheaf on a general open in Spec(R)

Nonnegative derivative bounded by function, show that $f$ is zero

If $\det(A-\lambda I)=\det(A^{-1}-\lambda I)$, then characteristic polynomial is coefficient symmetry

Showing $\frac{1-\cos \left((n-1)\pi/n\right)}{1-\cos \left(\pi/n\right)} \approx 4n^2/\pi^2$

Converting an equation based on square roots

Is Schilling's Corollary 8.9 really a corollary?

The cohomology ring of an oriented closed $3$-manifold with $\pi_1=\mathbb Z$

Different Coloring of regular n-gon

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