Questão 1445265

σM1(σ_C2(A) ≡ σ_C2(σ_M1(A))

π_{C1 OR C2 AND C3}(K) ≡ π _C2 (σ_{C1 OR C3}(K)))

(RU S) _xθ T_C1≡ (S U R) σ (T_C1)

A _C1B ≡ π_C1(A x B) – π_C1(B x A) + σ (B_C1)

π_{A, B, C} (π_{X, Y, Z}(...(π_{P, E,V} (S))...)) ≡ π_{A, B, C}(S)