clopen.solutions

Open problems

980 registered problems.

OP-00085 Lean verified
Where a symmetric stochastic matrix can be spectrally unique
NA · doubly stochastic matrices · inverse eigenvalue problems · OpenProblemsInNLA
OP-00086 Lean verified
Johnson's derivative-realizability conjecture
NA · critical points · inverse eigenvalue problems · nonnegative matrices · OpenProblemsInNLA
OP-00148 Open
Two permutation matrices generate the doubly stochastic spectral boundary
NA · doubly stochastic matrices · inverse eigenvalue problems · OpenProblemsInNLA · permutation matrices
OP-00158 Partially resolved
The graph complement conjecture for minimum symmetric rank
CO · graph complements · inverse eigenvalue problems · minimum rank · OpenProblemsInNLA
OP-00252 Lean verified
The delta conjecture for minimum symmetric rank
CO · inverse eigenvalue problems · maximum nullity · minimum rank · OpenProblemsInNLA