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Isabella
  • Member for 1 year, 10 months
  • Last seen more than a month ago
11 votes
1 answer
153 views

Is there an invariant way to derive the energy-momentum tensor?

5 votes
0 answers
89 views

How to derive the Sommerfeld radiation condition from the resolvent?

5 votes
1 answer
222 views

Are manifolds with the same constant scalar curvature locally isometric?

4 votes
0 answers
109 views

If an abelian group contains at most $n$ elements of order divisible by $n$, is it cyclic?

4 votes
0 answers
89 views

Does a weak solution have weak derivatives?

3 votes
1 answer
44 views

If $w \ge 0$ and $\mu$ is a finite measure on $X$ with $\mu(w = 0) \ge \mu(X)/2$, is $\mu(w > t) \le 2 \mu(|w - c| > t/2)$?

2 votes
0 answers
60 views

How much does the Lie algebra of Killing fields constrain the metric?

2 votes
1 answer
101 views

What are the radial geodesics of $g = dr^2 + s_c(r)^2 \hat g$?

0 votes
0 answers
99 views

Why isn't the splitting field always Galois?

0 votes
0 answers
74 views

Are all extensions of fields of characteristic $0$ separable?

0 votes
0 answers
51 views

Can a tensor of any rank be decomposed into symmetric/anti-symmetric parts?