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Language Wars - Church numerals - untyped lambda calculus
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| suc = λa.λb.λc.b (a b c) | |
| add = λa.λb.λc.λd.a c (b c d) | |
| mul = λa.λb.λc.a (b c) | |
| exp = λa.λb.b a | |
| pre = λa.λb.λc.a (λd.λe.e (d b)) (λf.c) (λg.g) | |
| sub = λa.λb.b pre a |
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More info: https://github.com/rsp/languagewars-churchnumerals