lean2/tests/lean/univ.lean

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universe Z ≥ M+3
(*
local env = get_environment()
assert(env:get_universe_distance("Z", "M") == 3)
assert(not env:get_universe_distance("Z", "U"))
*)
scope
universe Z ≥ U + 10
(*
local env = get_environment()
assert(env:get_universe_distance("Z", "U") == 10)
assert(env:get_universe_distance("Z", "M") ==
env:get_universe_distance("Z", "U") +
env:get_universe_distance("U", "M"))
*)
pop::scope
(*
local env = get_environment()
assert(env:get_universe_distance("Z", "M") == 3)
assert(not env:get_universe_distance("Z", "U"))
*)
universe Z1 ≥ U + 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.