Merge pull request #14 from Fingerzam/fix-typo2

fix typo: that they only -> that the only
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wadler 2018-05-14 11:07:54 -03:00 committed by GitHub
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@ -402,7 +402,7 @@ as earlier examples have shown.
## Extensionality {#extensionality}
Extensionality asserts that they only way to distinguish functions is
Extensionality asserts that the only way to distinguish functions is
by applying them; if two functions applied to the same argument always
yield the same result, then they are the same functions. It is the
converse of `cong-app`, introduced earlier.