Current library: Alpha v34, 4,223 checked-use theorems; Stable remains 432. Historical first admissions, original proof editions, and non-admitted aliases are preserved. Exact original first-admission records.
Definition in prerequisite notation
p = n + D ∨ n = p + DOnly definitions earlier in this acyclic notation graph are used here.
Hygienic expanded first-order definition
((p) = (n) + (D)) \/ ((n) = (p) + (D))The unchanged native kernel never receives this surface symbol. Binder-safe expansion produces only its existing first-order syntax.
Direct definition dependencies
none — first-order arithmetic only
Definitions depending on this notation
none
Checked theorems using this definition
none directly; see definition consumers