Description: Closure of exponentiation of nonnegative integers. (Contributed by Mario Carneiro, 28-May-2016)
Ref | Expression | ||
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Hypotheses | nn0expcld.1 | |
|
nn0expcld.2 | |
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Assertion | nn0expcld | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nn0expcld.1 | |
|
2 | nn0expcld.2 | |
|
3 | nn0expcl | |
|
4 | 1 2 3 | syl2anc | |