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Proof step 4 from proof tr-null (previous step)

⊦ _∃ λ r0, r1. null => mknode(r0, a, r1) * tr(r0, t0) * tr(r1, t1) = false

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ _∃ λ r, r0. false = false

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ P0 * P1 = P1 * P0], [CSIMPSEQ : ⊦ (P0 * P1) * P2 = P0 * P1 * P2], [CSIMPSEQ : ⊦ false * P = false], [CSIMPSEQ : ⊦ ⌜false⌝ = false], [CSIMPSEQ : ⊦ null => nd = ⌜false⌝ ])]]