Newbetuts

Let $Z$ be the image of a function $f: X \longrightarrow Y$. If $B \subset Y \backslash Z$, then $f^{-1}(B) = \emptyset$

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

When do $n$ ants in cyclic pursuit with constant velocity converge?

Confusion on the proof that there are "arbitrarily large gaps between successive primes"

Understanding proof related to Hungarian algorithm

If X is second-countable, then X is Lindelöf.

Baby Rudin Theorem 2.34.

Arnold's proof of Abel's theorem

Working out cyclic subgroups of $D_{8}$ [duplicate]

Proof that in an integral domain every prime element is irreducible [duplicate]

Rudin's proof on the Analytic Incompleteness of Rationals [duplicate]

Given $\triangle ABC$ isosceles with base AB, M and N the midpoints of the equal sides. Show the reflection of C is the midpoint of AB

Proving that a subgroup is normal if two equivalence relations on $A$ coincide

Confusion in proof of theorem 8.33 in Axler's Linear Algebra done right

Spivak's Chain Rule Proof (Image of proof provided)

Why is infinity multiplied by zero considered zero here?

Proof of Lemma: Every integer can be written as a product of primes

New posts in proof-explanation

Why do we buy the Mazur Swindle in knot theory?

Why isn't this approach in solving $x^2+x+1=0$ valid?

$\text{MSE}$ as an unbiased estimator for $\sigma^2$ [duplicate]

Let $Z$ be the image of a function $f: X \longrightarrow Y$. If $B \subset Y \backslash Z$, then $f^{-1}(B) = \emptyset$

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

When do $n$ ants in cyclic pursuit with constant velocity converge?

Confusion on the proof that there are "arbitrarily large gaps between successive primes"

Understanding proof related to Hungarian algorithm

If X is second-countable, then X is Lindelöf.

Baby Rudin Theorem 2.34.

Arnold's proof of Abel's theorem

Working out cyclic subgroups of $D_{8}$ [duplicate]

Proof that in an integral domain every prime element is irreducible [duplicate]

Rudin's proof on the Analytic Incompleteness of Rationals [duplicate]

Given $\triangle ABC$ isosceles with base AB, M and N the midpoints of the equal sides. Show the reflection of C is the midpoint of AB

Proving that a subgroup is normal if two equivalence relations on $A$ coincide

Confusion in proof of theorem 8.33 in Axler's Linear Algebra done right

Spivak's Chain Rule Proof (Image of proof provided)

Why is infinity multiplied by zero considered zero here?

Proof of Lemma: Every integer can be written as a product of primes