New posts in Proof Explanation

Understanding Epsilon-Delta Proof

For acute $\triangle ABC$, prove $(\cos A+\cos B)^2+(\cos A+\cos C)^2+(\cos B+\cos C)^2\leq3$

Whiskering a natural isomorphism yields a natural isomorphism

How to know if a 8 puzzle is solvable

On the proof of Heisenberg's uncertainty principle

Proving inverse image is a normal subgroup

Establishing that a function is a well-defined homomorphism

Proof by induction:$\frac{3}{5}\cdot\frac{7}{9}\cdot\frac{11}{13}\cdots\frac{4n-1}{4n+1}<\sqrt{\frac{3}{4n+3}}$

$X^*$ is separable then $X$ is separable [Proof explanation]

Infinity Summation problem (ANSWERED)