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Length of proof is 1. Level of proof is 1. ---------------- PROOF ---------------- 2 [] -E(x,y,z,v)| -E(x,y,z2,v2)|E(z,v,z2,v2). 5 [] E(y,ext(x,y,w,v),w,v). 7 [] -E(a,b,a,b). 8 [binary,7.1,2.3,factor_simp] -E(x,y,a,b). 9 [binary,8.1,5.1] $F.