22 lines
541 B
Text
22 lines
541 B
Text
/-
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Copyright (c) 2016 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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-/
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prelude
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import init.logic
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set_option new_elaborator true
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theorem unit_eq (a b : unit) : a = b :=
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unit.rec_on a (unit.rec_on b rfl)
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theorem unit_eq_unit (a : unit) : a = () :=
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unit_eq a ()
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attribute [instance]
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definition unit_subsingleton : subsingleton unit :=
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subsingleton.intro unit_eq
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attribute [instance]
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definition unit_is_inhabited : inhabited unit :=
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inhabited.mk ()
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