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New posts in elementary-set-theory
$\wedge,\cap$ and $\vee,\cup$ between Logic and Set Theory always interchangeable?
soft-question
logic
elementary-set-theory
intuition
A set which is not isomorphic to it's proper subset is finite
elementary-set-theory
solution-verification
set-theory
Meaning of pullback
elementary-set-theory
category-theory
limits-colimits
Are these open sets?
general-topology
elementary-set-theory
a totally ordered set with small well ordered set has to be small?
elementary-set-theory
order-theory
How is Russell’s Paradox equal to the universal set?
elementary-set-theory
Subtraction of elements in sets
elementary-set-theory
notation
How do you prove the trichotomy law for cardinal numbers?
elementary-set-theory
cardinals
Cardinality as "size of a set" [closed]
elementary-set-theory
Question about members in sets
combinatorics
elementary-set-theory
combinatorial-designs
Why does the Axiom of Selection solve Russell's Paradox in Set Theory?
elementary-set-theory
paradoxes
Examples of bijections from $\mathbb Z\to\mathbb Z$ such that their sum is a bijection?
functions
elementary-set-theory
examples-counterexamples
Number of nodes in an infinite binary tree
elementary-set-theory
graph-theory
Bolzano-Weierstrass for sequences of sets
analysis
elementary-set-theory
Meaning of "$\exists$" in "$\{y \in Y : \exists x \in X \text{ such that }f(x) = y\}$"
functions
elementary-set-theory
logic
quantifiers
What are your favorite proofs using mathematical induction? [closed]
elementary-set-theory
big-list
Notation for unordered product of sets
elementary-set-theory
notation
Is this Partition affirmation correct? [closed]
linear-algebra
elementary-set-theory
set-partition
supremum, infimum, max and min - assistance understanding the difference
real-analysis
elementary-set-theory
supremum-and-infimum
The number of families of subsets of $\{1,2,...,n\}$ whose union is not the whole set.
general-topology
combinatorics
elementary-set-theory
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