14 lines
289 B
Text
14 lines
289 B
Text
import logic
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inductive day :=
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monday, tuesday, wednesday, thursday, friday, saturday, sunday
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namespace day
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definition next_weekday d :=
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day.rec_on d tuesday wednesday thursday friday monday monday monday
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example : next_weekday (next_weekday saturday) = tuesday :=
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rfl
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end day
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