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Mathematics

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Answer score of 100 or more. This badge can be awarded multiple times.
Awarded 1029 times.
"Almost true": non-trivial claims that have exactly one counterexample
Awarded Apr 21 at 22:11
What is $0\div0\cdot0$?
Awarded Apr 20 at 12:01
Collection of surprising identities and equations.
Awarded Apr 7 at 17:21
How to show that every Boolean ring is commutative?
Awarded Mar 22 at 21:22
How to prove that all odd powers of two add one are multiples of three
Awarded Feb 11 at 2:45
Why is a geometric progression called so?
Awarded Jan 23 at 12:32
Why is the product of two rotation matrices not commutative?
Awarded Dec 28, 2025 at 23:17
Can we identify the duals of $\ell^\infty$ and $L^{\infty}$ with another "natural space"?
Awarded Nov 15, 2025 at 16:46
What exactly is the difference between weak and strong induction?
Awarded Oct 13, 2025 at 16:26
Volume of Region in 5D Space
Awarded Aug 28, 2025 at 20:53
Why a complete graph has $\frac{n(n-1)}{2}$ edges?
Awarded Aug 28, 2025 at 16:30
Continuity of the roots of a polynomial in terms of its coefficients
Awarded Aug 27, 2025 at 17:20
Example of Partial Order that's not a Total Order and why?
Awarded Aug 17, 2025 at 13:54
Express 99 2/3% as a fraction? No calculator
Awarded Jul 31, 2025 at 23:41
Can you explain the "Axiom of choice" in simple terms?
Awarded Jul 27, 2025 at 10:32
What is the crime of lèse-Bourbaki?
Awarded Jul 19, 2025 at 21:18
Why and How do certain manipulations in indefinite integrals "just work"?
Awarded Jun 16, 2025 at 23:15
Can the golden ratio accurately be expressed in terms of $e$ and $\pi$
Awarded Jun 9, 2025 at 11:22
What is special about the numbers 9801, 998001, 99980001 ..?
Awarded Jun 3, 2025 at 16:32
"Almost true": non-trivial claims that have exactly one counterexample
Awarded May 23, 2025 at 9:50
Is it true that $0.999999999\ldots=1$?
Awarded May 23, 2025 at 4:13
Zero to the zero power – is $0^0=1$?
Awarded May 20, 2025 at 1:10
Give a concrete sequence of rationals which converges to an irrational number and vice versa.
Awarded May 19, 2025 at 10:36
Is "The empty set is a subset of any set" a convention?
Awarded May 13, 2025 at 19:02
What is the meaning of an "irreducible representation"?
Awarded May 13, 2025 at 19:02
Where to start learning Linear Algebra?
Awarded May 12, 2025 at 12:11
What is the difference between Average and Expected value?
Awarded May 1, 2025 at 17:23
What is Lie Theory/ a Lie Group, simply?
Awarded Apr 29, 2025 at 10:58
Separable Hilbert space have a countable orthonormal basis
Awarded Apr 15, 2025 at 18:15
Do finite algebraically closed fields exist?
Awarded Apr 14, 2025 at 14:45
Why is the localization at a prime ideal a local ring?
Awarded Apr 10, 2025 at 10:37
why geometric multiplicity is bounded by algebraic multiplicity?
Awarded Apr 7, 2025 at 17:20
Any open subset of $\Bbb R$ is a countable union of disjoint open intervals
Awarded Apr 3, 2025 at 22:27
In calculus, which questions can the naive ask that the learned cannot answer?
Awarded Apr 2, 2025 at 16:45
Finding out the area of a triangle if the coordinates of the three vertices are given
Awarded Mar 18, 2025 at 4:22
Why is the determinant the volume of a parallelepiped in any dimensions?
Awarded Mar 15, 2025 at 23:47
How irrational quantities physically exist in nature?
Awarded Feb 24, 2025 at 6:45
Path to Basics in Algebraic Geometry from HS Algebra and Calculus?
Awarded Feb 14, 2025 at 20:06
Fermat's Last Theorem simple proof
Awarded Feb 13, 2025 at 18:33
How to generate random points on a sphere?
Awarded Feb 9, 2025 at 15:05
The Monty Hall problem
Awarded Feb 7, 2025 at 4:51
Why do mathematicians use single-letter variables?
Awarded Feb 5, 2025 at 1:02
Subtraction when second number is bigger than first number
Awarded Feb 2, 2025 at 9:08
Do most numbers have exactly $3$ prime factors?
Awarded Jan 23, 2025 at 12:12
Am I just not smart enough?
Awarded Jan 19, 2025 at 4:21
prove that $\frac{(2n)!}{(n!)^2}$ is even if $n$ is a positive integer
Awarded Jan 17, 2025 at 12:46
Expectation of the maximum of gaussian random variables
Awarded Jan 17, 2025 at 4:57
Advantages of Mathematics competition/olympiad students in Mathematical Research
Awarded Jan 7, 2025 at 9:57
Does a Fourier transformation on a (pseudo-)Riemannian manifold make sense?
Awarded Dec 29, 2024 at 10:05
Simplest or nicest proof that $1+x \le e^x$
Awarded Dec 10, 2024 at 1:35
Given a simple graph and its complement, prove that either of them is always connected.
Awarded Dec 7, 2024 at 18:49
Prove that every group of order $4$ is abelian
Awarded Dec 7, 2024 at 14:46
Is there really no way to integrate $e^{-x^2}$?
Awarded Dec 4, 2024 at 6:52
How to prove: if $a,b \in \mathbb N$, then $a^{1/b}$ is an integer or an irrational number?
Awarded Nov 26, 2024 at 16:57
The direct sum $\oplus$ versus the cartesian product $\times$
Awarded Nov 17, 2024 at 16:01
What is the geometrical difference between continuity and uniform continuity?
Awarded Nov 15, 2024 at 19:00
Integration with respect to counting measure.
Awarded Nov 14, 2024 at 13:46
How can you prove that the square root of two is irrational?
Awarded Nov 13, 2024 at 3:41
Proving the trace of a transformation is independent of the basis chosen
Awarded Oct 29, 2024 at 16:57
Why can't you square both sides of an equation?
Awarded Oct 17, 2024 at 15:22
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