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Jun 18, 2018 at 0:56 answer added Curtis McMullen timeline score: 11
Aug 27, 2017 at 2:17 comment added Terry Tao Using the Hodge star operation mapping $k$-vector fields to $d-k$-forms and vice versa (which is well defined once one selects a volume form), I mean that $X = * d * \alpha$ for some $2$-vector field $\alpha$.
Aug 27, 2017 at 1:08 comment added Ali Taghavi @TerryTao In the last paragraph what do you mean by "....$X$ is the divergence of a 2-vectorfield"?
S Jul 30, 2017 at 6:50 history bounty ended Ali Taghavi
S Jul 30, 2017 at 6:50 history notice removed Ali Taghavi
S Jul 25, 2017 at 16:13 history bounty started Ali Taghavi
S Jul 25, 2017 at 16:13 history notice added Ali Taghavi Reward existing answer
Jul 22, 2017 at 13:02 answer added Ludovic Rifford timeline score: 1
Jul 15, 2017 at 16:07 answer added Ludovic Rifford timeline score: 2
S Jul 5, 2017 at 14:43 history suggested Ali Taghavi
The conversations on this questions involves Riemannian geometry
Jul 5, 2017 at 14:30 review Suggested edits
S Jul 5, 2017 at 14:43
Jul 5, 2017 at 1:58 vote accept Terry Tao
Jul 4, 2017 at 21:34 answer added Robert Bryant timeline score: 48
Jul 4, 2017 at 13:30 answer added Ali Taghavi timeline score: 17
Jul 4, 2017 at 13:25 comment added Ali Taghavi @LiviuNicolaescu For some manifolds, say $S^3$, the first part of the question, the positivity of $\theta (X)$ is not satisfied if we apply your comment.Since the first coholomology vanish.
Jul 4, 2017 at 13:07 comment added Liviu Nicolaescu Take a closed $1$-form $\theta$. Form Cartna's formula we deduce
Jul 4, 2017 at 10:16 history asked Terry Tao CC BY-SA 3.0