Current library: Alpha v34, 4,223 checked-use theorems; Stable remains 432. Historical first admissions, original proof editions, and non-admitted aliases are preserved.
Definition in prerequisite notation
∃ h. n = 2 · h + 1Only definitions earlier in this acyclic notation graph are used here.
Hygienic expanded first-order definition
exists h. n = 2 * h + 1The 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
Checked theorems using this definition
none directly; see definition consumers