propose correction for ADD

I think it should be: `ADD = λab.(a S)b`
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Nick Henderson 2018-11-21 15:22:52 -08:00 committed by GitHub
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@ -111,7 +111,7 @@ we use the successor function `S(n) = n + 1` which is:
Using successor, we can define add:
`ADD = λab.(a S)n`
`ADD = λab.(a S)b`
**Challenge:** try defining your own multiplication function!