Description: A restriction of a function is a function. Compare Exercise 18 of TakeutiZaring p. 25. (Contributed by NM, 16-Aug-1994)
Ref | Expression | ||
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Assertion | funres | |
Step | Hyp | Ref | Expression |
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1 | resss | |
|
2 | funss | |
|
3 | 1 2 | ax-mp | |