Mathematics

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earned this badge 250 times.
How to calculate a decimal power of a number
Awarded Jun 27, 2020 at 7:31
Analytic method for determining if a function is one-to-one
Awarded Jun 15, 2020 at 15:56
Alternative proof that the parity of permutation is well defined?
Awarded May 30, 2020 at 15:17
Number of ways of choosing $m$ objects with replacement from $n$ objects
Awarded May 19, 2020 at 14:10
How to prove closure of $\mathbb{Q}$ is $\mathbb{R}$
Awarded May 14, 2020 at 14:03
Infinite group with only two conjugacy classes
Awarded May 3, 2020 at 23:56
The set of all $x$ such that $xHx^{-1}\subseteq H$ is a subgroup, when $H\leq G$
Awarded Apr 4, 2020 at 6:55
How is addition defined?
Awarded Apr 4, 2020 at 3:35
Difference between pairwise distinct and unique?
Awarded Mar 22, 2020 at 9:45
Bijection between ideals of $R/I$ and ideals containing $I$
Awarded Mar 20, 2020 at 12:20
Why is commutativity optional in multiplication for rings?
Awarded Mar 20, 2020 at 6:30
Connection between eigenvalues and eigenvectors of a matrix in different bases
Awarded Mar 16, 2020 at 1:20
Relationships between bounded and convergent series
Awarded Mar 4, 2020 at 21:31
Constants of integration in integration by parts
Awarded Feb 22, 2020 at 3:01
Continuous versus differentiable
Awarded Feb 4, 2020 at 2:15
Automorphism of the Field of rational functions
Awarded Feb 2, 2020 at 16:55
Prime ideals: definition, verification, and examples
Awarded Jan 28, 2020 at 13:55
Difference between free groups, free product of two groups, tensor product of two infinite cyclic groups
Awarded Jan 17, 2020 at 16:05
Definition of "point at infinity"
Awarded Jan 17, 2020 at 6:20
Existence of irreducible polynomials over finite field
Awarded Nov 25, 2019 at 10:10
How to find the basis for a vector space?
Awarded Nov 24, 2019 at 18:25
Understanding the Details of the Construction of the Tensor Product
Awarded Nov 20, 2019 at 3:00
Is it possible to construct an ordered field which is also algebraically closed?
Awarded Nov 12, 2019 at 7:40
What is a quotient ring and cosets?
Awarded Nov 5, 2019 at 13:15
What are the applications of the Mean Value Theorem?
Awarded Oct 24, 2019 at 3:15
Column Vectors orthogonal implies Row Vectors also orthogonal?
Awarded Oct 6, 2019 at 12:55
Upper limit of summation index lower than lower limit?
Awarded Sep 13, 2019 at 17:00
Why does Cantor's diagonal argument not work for rational numbers?
Awarded Jul 11, 2019 at 12:20
Why are symbols not written in words?
Awarded Jun 30, 2019 at 16:25
Quick way to find the number of the group homomorphisms $\phi:{\bf Z}_3\to{\bf Z}_6$?
Awarded Jun 28, 2019 at 15:05
Groups where all elements are order 3
Awarded Jun 24, 2019 at 8:30
Rigorously proving that a change-of-basis matrix is always invertible
Awarded May 23, 2019 at 18:10
How to solve this quadratic congruence equation
Awarded May 10, 2019 at 15:25
Prove that $x^{2} \equiv -1 \pmod p$ has no solutions if prime $p \equiv 3 \pmod 4$.
Awarded Apr 22, 2019 at 15:10
Matrix Inverses and Eigenvalues
Awarded Apr 10, 2019 at 23:35
A bestiary about adjunctions
Awarded Feb 27, 2019 at 8:30
Nontrivial subring with unity different from the whole ring?
Awarded Jan 16, 2019 at 1:15
Is there anything like GF(6)?
Awarded Dec 20, 2018 at 3:45
Showing two ring homomorphisms that agree on the integers must agree on the rationals
Awarded Oct 16, 2018 at 3:05
Main differences between analytic number theory and algebraic number theory
Awarded Oct 7, 2018 at 12:10
How can we show that $\mathbb Q$ is not a free $\mathbb Z$-module?
Awarded Sep 14, 2018 at 22:30
Constructing Continuous functions at given points
Awarded Sep 5, 2018 at 14:40
When are minimal and characteristic polynomials the same?
Awarded Aug 25, 2018 at 20:02
Diagonalizable transformation restricted to an invariant subspace is diagonalizable
Awarded Aug 7, 2018 at 19:05
Is every Noetherian module finitely generated?
Awarded Aug 2, 2018 at 1:00
Field automorphisms of $\mathbb{Q}$ - shouldn't there be only one?
Awarded Jul 13, 2018 at 1:15
Why is there no functor $\mathsf{Group}\to\mathsf{AbGroup}$ sending groups to their centers?
Awarded Jul 12, 2018 at 14:12
Category of all categories vs. Set of all sets
Awarded Jun 11, 2018 at 15:30
What does it mean to say a map "factors through" a set?
Awarded May 27, 2018 at 13:58
The difference between log and ln
Awarded May 16, 2018 at 11:48
How to prove: if $a,b \in \mathbb N$, then $a^{1/b}$ is an integer or an irrational number?
Awarded Mar 28, 2018 at 15:42
The rank of a linear transformation/matrix
Awarded Mar 1, 2018 at 16:16
What is the second principle of finite induction?
Awarded Feb 21, 2018 at 11:36
How to prove a limit exists using the $\epsilon$-$\delta$ definition of a limit
Awarded Jan 15, 2018 at 14:24
Examples of categories where epimorphism does not have a right inverse, not surjective
Awarded Dec 30, 2017 at 2:32
How are norms different from absolute values?
Awarded Nov 25, 2017 at 23:40
What's the difference between a monoid and a group?
Awarded Nov 6, 2017 at 12:06
Examples and further results about the order of the product of two elements in a group
Awarded Oct 10, 2017 at 3:12
Negation of if and only if?
Awarded Sep 8, 2017 at 18:10
Why is a dual space a vector space?
Awarded Sep 6, 2017 at 12:37
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