[Imprint][Data Privacy Statement][E-Mail]

View long theorem info. View the proof. Back to main index. View the specification. View theorem base summary, View theorem base listing, the used properties by spec, the dependency list, the symbol table,

Proof step 14 from proof legal-noncylic-equiv-reaches-null (previous step)

x1 .last = null, path(r ' + x1, H), r ∈ H, legal(H) ⊦ r = null, H[null] .nxt = null, x1 = [], ∃ r0. reachable(r, r0, H) ∧ H[r0] .nxt = null

User applied rule insert elim lemma

And closed the goal!

Rule argument

[x0lemmaarg: spec-name: list-last instance-name: reflist lemma-name: last-elim antecedent: x0 ≠ [] succedent: r = x0 .last ∧ x1 = x0 .butlast ↔ x0 = x1 + r ' substlist: [x0, r, x1] → [x1, r1, x] add preconditions?: F is rewrite lemma?: F current spec?: F rotate lemma?: F replace all?: F paths: () dummy: () ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ x0 + r ' ≠ []], [CSIMPSEQ : ⊦ (x0 + x1) + x2 = x0 + x1 + x2], [CSIMPSEQ : ⊦ ¬ path(r ' + x + null ', H)], [CSIMPELIM : x0 ≠ [] ⊦ r = x0 .last ∧ x1 = x0 .butlast ↔ x0 = x1 + r '])], [EXTRATERMS : (x1, r1, x)]]