| key ∈ ri, key0 ∈ ri, ∀ key. key ∈ ri → ri[key] ∈ fs ∧ key-cons(key, fs[ri[key]]), ∀ key. key ∈ ri → ri[key] ∈ fs ∧ node-closed(fs[ri[key]], ri, fs, ro) ⊦ key0 = key, node-closed(fs[ri[key]], ri[key, ri[key0]], fs[ri[key0], fs[ri[key]]], ro), ri[key0] ∈ fs |
Used terms: key0