Proof - Intersection S exists question from Jech's Set Theory
84609
Unary intersection of the empty set
17363
Prove that the intersection of two equivalence relations is an equivalence relation.
152193
The intersection of a closure with an open set
99464
Proof Concerning Indexed family of Sets and Intervals
1821
Proving $f(C) \setminus f(D) \subseteq f(C \setminus D)$ and disproving equality
28391
Prove the compactness of a set B
126633
Is a contradiction enough to prove a set equality to $\varnothing$?
28523
When would the intersection of the empty set mean anything?
75007
How can I prove this relation between the elementary set theory and the elementary logic?
157753
Show that any set in a metric space can be written as the intersection of open sets
109462
Looking for a counter example for non-connected intersection of descending chain of closed connected sets
74077
A intersection (A union B)
17703
$S$ be a collection of subsets of $\{1,...,100\}$ ; any two sets in $S$ has non-empty intersection , what is the maximum possible value of $|S|$?
122184
De Morgan's laws in logic and set theory
108619
Proving Baire's theorem: The intersection of a sequence of dense open subsets of a complete metric space is nonempty
7607
How to prove that $\mathbb{Q}$ is not the intersection of a countable collection of open sets.
106455
intersection of infinite collection of finite sets?