Spencer's math notes wiki.

Some useful links:

    * [[commutator_relations|Commutator relations]]
    * [[hodge_star|The Hodge star operator]]
    * [[integration_by_parts|Integration by parts]]
    * [[lie_derivative|Lie derivative]]
    * [[monotonicity|Monotonicity]]
    * [[second_fundamental_form|Second fundamental form]]
    * [[weitzenboeck_identity|Weitzenböck identity]]