Show that this set is denumerable
51094
Prove that the set of integer coefficients polynomials is countable
99656
Prove that the set of all algebraic numbers is countable
2935
Completness and Set of Result of One Set ?!?
109070
Question about the proof of the distributive property for sets
37783
Proving that a set of 2016 natural numbers contain a non-empty set with a sum divisible by 2016
58004
showing a collection of sets contain all closed sets
148992
A finite set is closed
67064
Uncountable minus countable set is uncountable
42603
How can I prove that the cadinality of a set minus a finite number of elements of it is still the same as the original set?
70034
Showing that this set of functions is a group.
54406
Is $\mathbb Q \times \mathbb Q $ a denumerable set?
104308
Proving a set is a Sigma Algebra
87830
Relating the union of the power set of a set to the set itself
123090
How to show that disjoint closed sets have disjoint open supersets?
17510
Proving a set is an abelian group.
71922
Prove Uncountable set minus a countable set is uncountable
114770
Proof that a perfect set is uncountable