lean2/tests/lean/univ.lean

universe M1 >= 1
universe U >= M1 + 1
definition TypeM1 := (Type M1)
universe Z ≥ M1+3
(*
local env = get_environment()
assert(env:get_universe_distance("Z", "M1") == 3)
assert(not env:get_universe_distance("Z", "U"))
*)

(*
local env = get_environment()
assert(env:get_universe_distance("Z", "M1") == 3)
assert(not env:get_universe_distance("Z", "U"))
*)

universe Z1 ≥ M1 + 1073741824.
universe Z2 ≥ Z1 + 1073741824.

universe U1
universe U2 ≥ U1 + 1
universe U3 ≥ U1 + 1
universe U4 ≥ U2 + 1
universe U4 ≥ U3 + 3
(*
local env = get_environment()
assert(env:get_universe_distance("U4", "U1") == 4)
assert(env:get_universe_distance("U4", "U3") == 3)
assert(env:get_universe_distance("U4", "U2") == 1)
*)
universe U1 ≥ U4.

universe Z >= U.
universe Z >= U + 1.