In theoretical physics, a constraint algebra is a linear space of all constraints and all of their polynomial functions or functionals whose action on the physical vectors of the Hilbert space should be equal to zero. For example, in electromagnetism, the equation for the Gauss' law ∇ ⋅ E → = ρ {\displaystyle \nabla \cdot {\vec {E}}=\rho } is an equation of motion that does not include any time derivatives.
In theoretical physics, a constraint algebra is a linear space of all constraints and all of their polynomial functions or functionals whose action on the physical vectors of the Hilbert space should be equal to zero. For example, in electromagnetism, the equation for the Gauss' law ∇ ⋅ E → = ρ {\displaystyle \nabla \cdot {\vec {E}}=\rho } is an equation of motion that does not include any time derivatives.
Source: Wikipedia "Constraint algebra" · CC BY-SA 4.0
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