16 lines
373 B
Text
16 lines
373 B
Text
import data.num
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namespace foo
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constant le : num → num → Prop
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axiom le_trans {a b c : num} : le a b → le b c → le a c
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attribute le_trans [trans]
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infix `<<`:50 := le
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end foo
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namespace foo
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theorem T {a b c d : num} : a << b → b << c → c << d → a << d
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:= assume H1 H2 H3,
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calc a << b : H1
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... << c : H2
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... << d : H3
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end foo
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