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Mathematics

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 Nice Answer
Answer score of 10 or more. This badge can be awarded multiple times.

earned this badge 29 times.
Tarski's decidability proof on real closed field and Peano arithmetic
Awarded Mar 2 at 4:42
Set of discontinuous points
Awarded Oct 9, 2023 at 2:37
Axioms of set theory and logic
Awarded Dec 20, 2022 at 12:35
Cantor-Bendixson theorem proof
Awarded Oct 13, 2022 at 1:00
Definition of the Infinite Cartesian Product
Awarded Dec 21, 2021 at 14:11
set in $\mathbb{R}$ which is not a Borel-set
Awarded Aug 4, 2018 at 7:01
Cartesian products of families in Halmos' book.
Awarded Jun 4, 2018 at 20:57
What is the future of Set Theory if it is NOT the foundation of Mathematics?
Awarded Nov 4, 2017 at 21:14
How to prove that $\mathbb{Q}$ ( the rationals) is a countable set
Awarded Oct 16, 2017 at 15:36
Prove that if $n$ is not the square of a natural number, then $\sqrt{n}$ is irrational.
Awarded May 11, 2017 at 7:42
What is the "order" of an automorphism of a group?
Awarded Apr 21, 2017 at 4:03
Open dense subset with small outer measure
Awarded Oct 13, 2016 at 16:37
What is the definition of a group entirely in first-order predicate logic?
Awarded Jul 14, 2016 at 12:05
How to determine if 2 points are on opposite sides of a line
Awarded May 9, 2016 at 18:08
Prove that every element of a finite group has an order
Awarded Feb 1, 2016 at 2:24
Does commutativity imply Associativity?
Awarded Jan 23, 2016 at 18:17
Examples of uncountable sets with zero Lebesgue measure
Awarded Apr 10, 2015 at 8:25
Showing that $[0,1]$ is compact
Awarded Mar 15, 2014 at 8:29
Is $\{\emptyset\}$ a subset of $\{\{\emptyset\}\}$?
Awarded Sep 12, 2013 at 9:12
Find an ideal $I$ of $\mathbb{Z}[i]$ such that $\mathbb{Z}[i]/{I}$ is a field
Awarded Aug 23, 2013 at 19:41
When I state $(a\cdot b) \cdot c = (a \cdot c) \cdot b$ , what properties am I using?
Awarded Aug 3, 2013 at 14:27
Why is the Vitali set not necessarily equal to the interval e.g. [0,1]?
Awarded Sep 14, 2012 at 4:08
Can I prove that this polynomial is irreducible?
Awarded Aug 29, 2012 at 8:30
If $\gcd(a,b)=1$, then $\gcd(a^n,b^n)=1$
Awarded Jul 5, 2012 at 12:59
"Negative" versus "Minus"
Awarded Jun 12, 2012 at 4:42
$\{1,1\}=\{1\}$, origin of this convention
Awarded Jun 8, 2012 at 13:25
Is the class of subsets of integers countably infinite?
Awarded Mar 19, 2012 at 4:36
Prove/Disprove that if two sets have the same power set then they are the same set
Awarded Sep 19, 2011 at 16:14
Are the axioms for abelian group theory independent?
Awarded Aug 7, 2011 at 2:13

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