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De Bruijn: Fix a verb form (#527)

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Marko Dimjašević 2020-10-05 17:17:06 +02:00 • committed by GitHub
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src/plfa/part2/DeBruijn.lagda.md
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@ -756,7 +756,7 @@ The logician Haskell Curry observed that getting the
definition of substitution right can be a tricky business. It definition of substitution right can be a tricky business. It
can be even trickier when using de Bruijn indices, which can can be even trickier when using de Bruijn indices, which can
often be hard to decipher. Under the current approach, any often be hard to decipher. Under the current approach, any
definition of substitution must, of necessity, preserves definition of substitution must, of necessity, preserve
types. While this makes the definition more involved, it types. While this makes the definition more involved, it
means that once it is done the hardest work is out of the way. means that once it is done the hardest work is out of the way.
And combining definition with proof makes it harder for errors And combining definition with proof makes it harder for errors