New posts in proof-writing

A practical way to check if a matrix is positive-definite

linear-algebra matrices numerical-methods proof-writing positive-definite

A proof that the Cantor set is Perfect

real-analysis proof-verification proof-writing cantor-set

Prove that there is only one unique base b representation of any natural number.

elementary-number-theory proof-writing modular-arithmetic

Proof by induction of Bernoulli's inequality $ (1+x)^n \ge 1+nx$

inequality proof-verification proof-writing induction

The "assumption" in proof by induction

proof-writing induction proof-explanation fake-proofs

Infinite set always has a countably infinite subset

proof-writing set-theory

Prove if $56x = 65y$ then $x + y$ is divisible by $11$

proof-writing divisibility

Proving the so-called "Well Ordering Principle"

elementary-number-theory proof-writing

Show that the eigenvalues of a unitary matrix have modulus $1$

linear-algebra matrices proof-writing eigenvalues-eigenvectors unitary-matrices

When stating a theorem in textbook, use the word "For all" or "Let"? [duplicate]

Book about technical and academic writing

reference-request proof-writing book-recommendation article-writing publishing

A continuous function $f$ from a closed bounded interval $[a, b]$ into $\mathbb{R}$ is uniformly continuous

analysis proof-writing

Advice for writing good mathematics?

soft-question big-list proof-writing article-writing

My teacher describes absolute value confusingly: $|x|=\pm x,\quad \text{if}\enspace x>0 $.

algebra-precalculus proof-writing absolute-value

Prove that if $\mathcal P(A) \cup \mathcal P(B)= \mathcal P(A\cup B)$ then either $A \subseteq B$ or $B \subseteq A$. [duplicate]

elementary-set-theory proof-writing

Review of a proof for De Moivre's theorem using mathematical induction

proof-verification complex-numbers proof-writing polar-coordinates

For all infinite cardinals $\kappa, \ (\kappa \times \kappa, <_{cw}) \cong (\kappa, \in).$

proof-writing cardinals ordinals elementary-set-theory

How to prove or statements

logic proof-writing propositional-calculus

Proving that a number is divisible by 3 if and only if the sum of its digits is divisible by 3

proof-writing solution-verification divisibility

What are some common proof strategies in mathematics?

reference-request soft-question big-list proof-writing