Corpus v3 · Formal theorem
cid005349
FTH0087canonicalv1tau_strict_mem_wf (theorem)
/-- [I.P12] Well-foundedness of nonzero strict τ-membership: there is no infinite descending chain ... ∈^strict_τ x₂ ∈^strict_τ x₁ ∈^strict_τ x₀ when all elements are nonzero. Proof: tau_strict_mem_nz is a subrelation of Nat.lt (via identity), and Nat.lt is well-founded. -/
Formalization
lean_axiom_freesorries: 0project axioms: 0
Identifiers
Aliases & legacy IDs
tau_strict_mem_wftau-strict-mem-wfTauLib.BookI.Sets.Powerset::tau_strict_mem_wfRelease lines
corpus_v2corpus_v3_workingVersion & History
Status disclaimer
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