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Colin Tan's user avatar
Colin Tan's user avatar
Colin Tan's user avatar
Colin Tan
  • Member for 5 years, 9 months
  • Last seen more than a week ago
  • Singapore
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I teach mathematics tuition freelance.

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question
34
Alternatives to the law of the excluded middle
May 3, 2021
question
5
Modulo $x^2 + y^2 - 1$, is every homogeneous polynomial that is a square of a polynomial, necessarily of sum of squares of homogeneous polynomials?
Mar 30, 2023
question
5
Is the interior of the tensor product of two convex cones equal to the tensor product of their respective interiors?
Apr 13, 2023
question
4
Is the order arithmetic of the positive reals o-minimal?
Feb 27, 2019
question
3
Asymptotics of A000613
Sep 24
question
2
Number of binary matroids of rank $r$ on a ground set with $n$ elements
Sep 19
question
2
Is there a ternary Cayley graph on 27 vertices that is a non-complete core?
Nov 15
question
1
Doing reverse mathematics by regarding modal logic as weak first-order logic
Oct 13, 2022
question
1
Explicit description of the space of global sections of a torus invariant Weil divisor over a real toric variety
Nov 29, 2022
question
1
abstract description of the topology on a real vector space defined by the algebraically open sets
Jan 24, 2023
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8
Find the integral of $\int_0^\infty \frac{1}{x}\ln(x)\ln\left(\frac{1+x^2}{(1+x)^2}\right)dx$
7
Number of $k$-element linearly equivalence classes of ${\mathbb{F}_2}^4$
6
Is there a ternary Cayley graph on $27$ vertices that is a non-complete core?
6
For positive real numbers $x,y,z$ with $xy+yz+zx=1$, prove that $\frac{2}{xyz}+9xyz \geq 7(x+y+z).$
6
Struggling to retain mathematical knowledge as a self-learner.