t == x IN t & ref(x) = y t
t:(u Term), x:u. (t reps x u) Propt,x:Term. (t reps x Term) Propt,r:Term. t/r Term| Some definitions of interest. | |
| reps | Def x reps y t == x IN t & ref(x) = y t |
| Thm* t:(u Term), x:u. (t reps x u) Prop | |
| Thm* t,x:Term. (t reps x Term) Prop | |
| subx | Def t/e == t[e/X] |
| Thm* t,r:Term. t/r Term |
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