What do indexed mean in 'indexed family' in set theory?
62378
What is the difference between "family" and "set"?
127233
Cardinality of order types in $\mathbb{N}$
130771
Sets and the principle of inclusion and exclusion
93198
The order of a conjugacy class is bounded by the index of the center
95042
Textbooks on set theory
81406
Does every set have a group structure?
51674
use of $\sum $ for uncountable indexing set
134050
Question about set notation: what does $]a,b[$ mean?
104744
Can sets of cardinality $\aleph_1$ have nonzero measure?
3101
Meaning of a set in the exponent
66301
The cardinality of the set of countably infinite subsets of an infinite set
109173
Why the Sets defined in the Cumulative Hierarchy transitive?
87830
Relating the union of the power set of a set to the set itself
50506
What concept does an open set axiomatise?
135341
number theory about index
120188
Why is the real line not used in Descriptive Set Theory?
60424
Uncountable family of uncountable compact subsets of $\mathbb{R}$