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Questions Tagged with "elementary set theory" (Page 3)

Explore solved questions tagged with "elementary set theory" or help others by answering their unsolved questions related to "elementary set theory".

Sets; is (A∩B)∪C the same as A∩(B∪C)?

1 answer

Mathematics Asked 3 years ago by user839131

The number of the sets, $A$ s.t. $f^{-1}(f(A))=A$

1 answer

Mathematics Asked 3 years ago by se-hyuck yang

In what sense do we say two functions are equal?

0 answer

Mathematics Asked 3 years ago by Ziqi Fan

How is this sentence written correctly in maths? (sets)

0 answer

Mathematics Asked 3 years ago by eyesima

What's the difference between a Singleton set and its member?

2 answer

Mathematics Asked 3 years ago by Richard Bamford

Questions about set cardinalities (infinite/finite).

1 answer

Mathematics Asked 3 years ago by Pwaol

To prove an apparently obvious statement: if $A_1subseteq A_2 subseteq ... subseteq A_n$, then $bigcup_{i=1}^n A_i = A_n$

2 answer

Mathematics Asked 3 years ago

Verify: Prove that $(A times B) cap (C times D) = (A cap C) times (B cap D)$

0 answer

Mathematics Asked 3 years ago

Give an example of a set A with equivalence relations R and S for which S∘R ≠ R∘S

1 answer

Mathematics Asked 3 years ago by Harry Solomon

Proof by contradiction(sets)

1 answer

Mathematics Asked 3 years ago by JASDEEP SINGH

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