New posts in proof-writing

Proof by induction that $n^3 + (n + 1)^3 + (n + 2)^3$ is a multiple of $9$. Please mark/grade.

elementary-number-theory proof-writing induction proof-verification divisibility

How can we think and/or write rigorously about integration by substitution?

calculus integration proof-writing definition

Is it possible to have a vector space in which $\vec{v}=-\vec{v}$, yet $\vec{v}\neq \vec{0}$?

linear-algebra vector-spaces proof-writing field-theory finite-fields

Theorem 15.2 of Munkres Topology

general-topology proof-writing solution-verification alternative-proof

Proving $n\sin(\frac{\pi}{n})<\pi<n\tan(\frac{\pi}{n})$ ; obtaining results from it.

geometry trigonometry proof-verification proof-writing math-history

Does there exist a continuous surjection from $\Bbb R^3-S^2$ to $\Bbb R^2-\{(0,0)\}$?

contest-math general-topology continuity proof-writing

proving that the area of a 2016 sided polygon is an even integer

geometry proof-writing integers polygons angle

Exercise 5, Section 13 of Munkres’ Topology

alternative-proof general-topology proof-writing solution-verification

Can every true theorem that has a proof be proven by contradiction?

logic proof-writing proof-theory

Prove that $\log X < X$ for all $X > 0$

logarithms proof-writing

Problems understanding proof of if $x + y = x + z$ then $y = z$ (Baby Rudin, Chapter 1, Proposition 1.14)

real-analysis proof-writing proof-explanation

Fields - Proof that every multiple of zero equals zero

abstract-algebra soft-question field-theory proof-verification proof-writing

Prove this refinement on the uniqueness of the identity element in a group

abstract-algebra group-theory proof-writing solution-verification

Having hard time understanding proofs by contradiction.

logic proof-writing

What does it mean when proof by contradiction doesn't lead to a contradiction?

proof-verification proof-writing arithmetic

Beautiful, simple proofs worthy of writing on this beautiful glass door [closed]

soft-question proof-writing recreational-mathematics

How many words (i.e. not "math" symbols") should I use in my proofs? ${}{}$

logic proof-writing

Why, logically, is proof by contradiction valid?

logic proof-writing definition boolean-algebra

Formally prove that every finite language is regular

proof-writing regular-language

In a math paper, what is a remark?

proof-writing terminology article-writing