that they only -> that the only
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@ -402,7 +402,7 @@ as earlier examples have shown.
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## Extensionality {#extensionality}
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Extensionality asserts that they only way to distinguish functions is
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Extensionality asserts that the only way to distinguish functions is
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by applying them; if two functions applied to the same argument always
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yield the same result, then they are the same functions. It is the
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converse of `cong-app`, introduced earlier.
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