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Elementary-set-theory
New post in Elementary-set-theory
Decide whether the set A of positive integers divisible by 17 and B the set of positive integers divisible by 11 are in bijection.
July 26th, 2022
functions
elementary-set-theory
What is countably infinite set?
January 15th, 2023
elementary-set-theory
number-theory
prove that 2 closed interval sets have equal cardinalities
December 28th, 2022
elementary-set-theory
Prove (0,1) is uncountable (any method)
July 23rd, 2022
cardinals
elementary-set-theory
Is there an injective function from the set of natural numbers N to the set of rational numbers Q, and viceversa?
August 18th, 2022
functions
elementary-set-theory
How is the set of rational numbers countably infinite?
October 28th, 2022
elementary-set-theory
Which of the following sets are equal?
November 10th, 2022
elementary-set-theory
discrete-mathematics
Suppose each of A,B, and C is a nonempty set. Prove that if (AxB) is a subset of (BxC), then A is a subset of C.
July 23rd, 2022
elementary-set-theory
discrete-mathematics
If $A$ and $B$ are sets, and $A$ is element of $B$
August 14th, 2022
discrete-mathematics
elementary-set-theory
Is an empty set equal to another empty set?
July 22nd, 2022
elementary-set-theory
List the elements of the set
July 31st, 2022
elementary-set-theory
discrete-mathematics
what does this symbol mean (like a perpendicular symbol, in set theory)
July 22nd, 2022
notation
elementary-set-theory
logic
Set theory (A\C) \ (B\C) = (A\B)\C
July 29th, 2022
elementary-set-theory
How to show that $\mathbb Z \times \mathbb Z \times \mathbb Z$ is countable by bijection?
July 29th, 2022
elementary-set-theory
Can I show that two sets are equinumerous by showing a bijection between them?
August 1st, 2022
elementary-set-theory
Showing that a set is countably infinite by defining a bijection between $\Bbb N$ and that set.
November 16th, 2020
elementary-set-theory
infinity
Cartesian product of Power Sets
August 1st, 2022
elementary-set-theory
Give a Bijection that is in-between 2 intervals and use a formal proof to show that it is a bijection.
April 3rd, 2020
functions
discrete-mathematics
elementary-set-theory
How to prove that $\mathbb{Z} \times \mathbb{Z}$ is countable.
August 1st, 2022
elementary-set-theory
discrete-mathematics
Is every point of rational number boundary point?
January 25th, 2020
multivariable-calculus
general-topology
elementary-set-theory
Rational number SAT
May 28th, 2020
elementary-set-theory
irrational-numbers
Specify a bijection from [0,1] to (0,1].
August 1st, 2022
elementary-set-theory
Is ∅ equivalent to {∅}?
August 1st, 2022
elementary-set-theory
many to one functions
March 25th, 2020
functions
elementary-set-theory
Vector space of infinite sequences in $\Bbb R$
August 1st, 2022
elementary-set-theory
linear-algebra
Cartesian product and union
August 1st, 2022
elementary-set-theory
Functions involving infinite set -> infinite set and one-to-one and/or onto
March 23rd, 2020
elementary-set-theory
discrete-mathematics
functions
Show that a relation is equivalent if it is both reflexive and cyclic.
September 27th, 2021
equivalence-relations
relations
elementary-set-theory
Is the set of real numbers not a subset of the set of whole numbers?
August 1st, 2022
elementary-set-theory
Proving properties of the images and inverse images of functions
July 1st, 2020
discrete-mathematics
elementary-set-theory
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