New posts in proof-explanation

Proof of infinitely many prime numbers

elementary-number-theory prime-numbers proof-explanation

Prove the diagonals of rhumbus are perpendicular and angles bisector

geometry solution-verification proof-explanation euclidean-geometry triangles

Given $~ \mathrm{a,b,c >0 ~ , ~ a+b+c=1 } ~ $ then prove $~ \mathrm{\sum\limits_{cyc} \sqrt{a+b^2 } \geqslant 2 } $

proof-explanation cauchy-schwarz-inequality constraints

Simple Fitch Proof without using DeMorgan's Law

logic solution-verification proof-explanation first-order-logic predicate-logic

Nullity of T vs. nullity of $T^2$

linear-algebra linear-transformations proof-explanation

When learning mathematics should one prove everything one learns?

proof-verification soft-question proof-writing proof-explanation learning

Why simply transitivity deduces the morphism has degree $1$? [duplicate]

algebraic-geometry proof-explanation elliptic-curves

Proving $\operatorname{Var}(X) = E[X^2] - (E[X])^2$

probability proof-explanation expected-value variance

Understanding a solution that $f(x) = x^n$ is continuous.

real-analysis proof-explanation

Finding all possible proofs

proof-explanation euclidean-geometry circles ratio

Understanding the proof of Definition by Recursion

logic proof-explanation propositional-calculus recursion

How do people pick $\delta$ so fast in $\epsilon$-$\delta$ proofs

calculus real-analysis proof-writing epsilon-delta proof-explanation

Prove that if $x \in R,$ then there exists $n \in Z$ satisfying $x \leq n < x+1$

real-analysis inequality proof-explanation ceiling-and-floor-functions

If $4\mid a+bc$ and $6\mid b+ac$ prove that $2\mid a^2-b^2$

proof-explanation

How to show that the set of orthogonal n x n matrices forms a group under multiplication

linear-algebra proof-explanation

Prove that the elements of sequences $(a_n),(b_n)$ are rational numbers such that $a_n<\sqrt{2}<b_n=a_n+2^{-n}$ for all $n \geq 1$ using induction

real-analysis sequences-and-series inequality induction proof-explanation

Let X be a T1 space, and show that X is normal if and only if each neighbourhood of a closed set F contains the closure of some neighbourhood of F

general-topology proof-writing proof-explanation separation-axioms

Why is $|H \cdot gP|=1$?

group-theory proof-explanation group-actions sylow-theory

Divisor of $m$ and $n$ divides $m - qn$ (in proof of Euclidean algorithm)

elementary-number-theory discrete-mathematics divisibility proof-explanation

How to prove or disprove $\forall x\in\Bbb{R}, \forall n\in\Bbb{N},n\gt 0\implies \lfloor\frac{\lfloor x\rfloor}{n}\rfloor=\lfloor\frac{x}{n}\rfloor$.

algebra-precalculus proof-writing proof-explanation ceiling-and-floor-functions