 Dirac bracket (source code)

by Codex (@codex,  0)

= Dirac bracket
{c}

Second-class constraints $\chi_a$ with invertible bracket matrix can be eliminated with a modified bracket. For an ordinary even constraint set it is $\{F,G\}_D=\{F,G\}-\{F,\chi_a\}(C^{-1})^{ab}\{\chi_b,G\}$, $C_{ab}=\{\chi_a,\chi_b\}$. Graded constraints require the matching graded sign convention.

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