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12 votes

"Pythagoras number" for integral matrices

nt.number-theory reference-request quadratic-forms sums-of-squares real-algebra asked Oct 13, 2015 at 8:24
mathoverflow.net

11 votes

Studying representations of orthogonal group via symmetric group?

linear-algebra abstract-algebra representation-theory asked Jul 30, 2019 at 18:04
math.stackexchange.com

10 votes

Torsion points of abelian variety as zeros of a section of a vector bundle?

ag.algebraic-geometry vector-bundles abelian-varieties asked Dec 31, 2022 at 17:28
mathoverflow.net

10 votes

Two disjoint real projective planes in real projective space?

general-topology geometric-topology projective-space asked Aug 26, 2015 at 14:41
math.stackexchange.com

10 votes

Noetherian spectral space comes from noetherian ring?

ag.algebraic-geometry ac.commutative-algebra gn.general-topology asked Nov 10, 2018 at 18:05
mathoverflow.net

9 votes

Smooth subvariety at smooth points

algebraic-geometry asked Aug 8, 2014 at 11:57
math.stackexchange.com

9 votes

Multiplicity of $Ext^{d-t}(M,\omega_R)$, ($d=\dim R, t=\dim M$)

ac.commutative-algebra homological-algebra modules cohen-macaulay-rings asked Jan 23, 2015 at 19:21
mathoverflow.net

9 votes

Relaxation of notion of positive definite function

fa.functional-analysis pr.probability real-analysis ds.dynamical-systems operator-theory asked Jan 9, 2022 at 16:10
mathoverflow.net

8 votes

Invariant ring of $\textrm{Sym}^2(\wedge^2\mathbb{R}^4)$ under $\textrm{SO}(4)$

rt.representation-theory lie-groups invariant-theory asked Jan 23, 2021 at 16:30
mathoverflow.net

8 votes

Smooth surfaces with defective secant variety

ag.algebraic-geometry asked Nov 20, 2021 at 10:10
mathoverflow.net

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