Singular Manual: InvariantQ

| #### D.7.3.6 InvariantQ Procedure from library `rinvar.lib` (see rinvar_lib). Usage: InvariantQ(f, G, action); poly f; ideal G, action Purpose: check whether the polynomial f is invariant w.r.t. G, where G acts via 'action' on K^m. Assume: basering = K[s_1,...,s_m,t_1,...,t_m] where K = Q of K = Q(a) and minpoly != 0, f contains only t_1,...,t_m, G is the ideal of an algebraic group and a standardbasis. Return: int; 0 if f is not invariant, 1 if f is invariant Note: G need not be finite

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