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Questions Tagged with "elementary set theory"

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

$(A^ctimes B)cup(Atimes B^c)cup(A^c times B^c)=(A^ctimes Y)cup(Xtimes B^c)$

1 answer

Mathematics Asked 2 years ago by Yahya B. Jaber

Union of two non empty and mutually exclusive finite sets is finite

0 answer

Mathematics Asked 2 years ago

Existance and example of extraordinary set and set of all such extraordinary sets in the context of Russels paradox

1 answer

Mathematics Asked 2 years ago by Nascimento de Cos

Inverse of stereographic projection

2 answer

Mathematics Asked 2 years ago by Thoth

How to define sums of naturals in the context of set theory

0 answer

Mathematics Asked 2 years ago

Describing the set ${nin Bbb Nlvert (n>1)wedge (forall x,yin Bbb N)[(xy=n)implies (x=1lor y=1)]}$

2 answer

Mathematics Asked 2 years ago

Question on cardinality of sets

1 answer

Mathematics Asked 2 years ago by jshthng

Suppose $A , B , C$ are arbitrary sets and we know that $( A times B ) cap ( C times D ) = emptyset$ What conclusion can we draw?

3 answer

Mathematics Asked 2 years ago by Anonymous Molecule

If $exists$ a surjection from nonempty set $A$ onto $mathcal{P}(mathbb{Z_+})$, then $A$ is uncountable

0 answer

Mathematics Asked 2 years ago

Is a convex set of permutation matrices $ntimes n$ ($mathbb{P}_{n}cap mathbb{C}$) a singleton?

0 answer

Mathematics Asked 3 years ago by Joey Cho

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