Newbetuts

Use contradiction to show that if $A$ × $B$ and $C$× $D$ are disjoint, then either $A\cap C\:=\:\varnothing$ or $B\cap D\:=\:\varnothing$

How do I formally show that the Zariski tangent space of the intersection of two closed subschemes is the intersection of the tangent spaces?

prove that $2\sqrt5 +\sqrt{11}$ is irrational

Suppose $f:[0,1] \Rightarrow \mathbb{R}$ is continuous and $\int_0^x f(x)dx = \int_x^1 f(x)dx$. Prove that $f(x) = 0$ for all $x$

How to prove fraction inequality proof

Period of the decimal expression for the rational number $\frac{1}{n}$ is at most $n-1$

Proof that any self-complementary graph has to have $4k$ or $4k+1$ vertex, for some $k \in \mathbb N$

Proof of product rule for limits

Inclusion–exclusion principle [Proof verification]

Proof of a binomial identity $\sum_{k=0}^n {n \choose k}^{\!2} = {2n \choose n}.$

Prove that $\dim(U+W) + \dim(U\cap W) = \dim U + \dim W$

Checking that a $3$-D diagram is commutative

Some trouble with the induction

$4\cos(x) -x = 0$: There exist at least two solutions [closed]

How do I show that the sum of two random variables is random variable?

How to explain that proof is important

New posts in proof-writing

Proving that a solution to the "Cat behind 7 doors" puzzle is optimal

I can't seem to prove propositions involving floor/ceiling function and the like..

How to show $\lim\limits_{n \to \infty} \int_0^{2\pi}\cos(nx)f(x)dx=0$ using integration by parts?

Induction Proof: Formula for Sum of n Fibonacci Numbers

Use contradiction to show that if $A$ × $B$ and $C$× $D$ are disjoint, then either $A\cap C\:=\:\varnothing$ or $B\cap D\:=\:\varnothing$

How do I formally show that the Zariski tangent space of the intersection of two closed subschemes is the intersection of the tangent spaces?

prove that $2\sqrt5 +\sqrt{11}$ is irrational

Suppose $f:[0,1] \Rightarrow \mathbb{R}$ is continuous and $\int_0^x f(x)dx = \int_x^1 f(x)dx$. Prove that $f(x) = 0$ for all $x$

How to prove fraction inequality proof

Period of the decimal expression for the rational number $\frac{1}{n}$ is at most $n-1$

Proof that any self-complementary graph has to have $4k$ or $4k+1$ vertex, for some $k \in \mathbb N$

Proof of product rule for limits

Inclusion–exclusion principle [Proof verification]

Proof of a binomial identity $\sum_{k=0}^n {n \choose k}^{\!2} = {2n \choose n}.$

Prove that $\dim(U+W) + \dim(U\cap W) = \dim U + \dim W$

Checking that a $3$-D diagram is commutative

Some trouble with the induction

$4\cos(x) -x = 0$: There exist at least two solutions [closed]

How do I show that the sum of two random variables is random variable?

How to explain that proof is important