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Mirrors > Home > ILE Home > Th. List > df-iexp | Unicode version |
Description: Define exponentiation to nonnegative integer powers. This definition is not meant to be used directly; instead, exp0 9259 and expp1 9262 provide the standard recursive definition. The up-arrow notation is used by Donald Knuth for iterated exponentiation (Science 194, 1235-1242, 1976) and is convenient for us since we don't have superscripts. 10-Jun-2005: The definition was extended to include zero exponents, so that per the convention of Definition 10-4.1 of [Gleason] p. 134. 4-Jun-2014: The definition was extended to include negative integer exponents. The case gives the value , so we will avoid this case in our theorems. (Contributed by Jim Kingdon, 7-Jun-2020.) |
Ref | Expression |
---|---|
df-iexp |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cexp 9254 | . 2 | |
2 | vx | . . 3 | |
3 | vy | . . 3 | |
4 | cc 6887 | . . 3 | |
5 | cz 8245 | . . 3 | |
6 | 3 | cv 1242 | . . . . 5 |
7 | cc0 6889 | . . . . 5 | |
8 | 6, 7 | wceq 1243 | . . . 4 |
9 | c1 6890 | . . . 4 | |
10 | clt 7060 | . . . . . 6 | |
11 | 7, 6, 10 | wbr 3764 | . . . . 5 |
12 | cmul 6894 | . . . . . . 7 | |
13 | cn 7914 | . . . . . . . 8 | |
14 | 2 | cv 1242 | . . . . . . . . 9 |
15 | 14 | csn 3375 | . . . . . . . 8 |
16 | 13, 15 | cxp 4343 | . . . . . . 7 |
17 | 12, 4, 16, 9 | cseq 9211 | . . . . . 6 |
18 | 6, 17 | cfv 4902 | . . . . 5 |
19 | 6 | cneg 7183 | . . . . . . 7 |
20 | 19, 17 | cfv 4902 | . . . . . 6 |
21 | cdiv 7651 | . . . . . 6 | |
22 | 9, 20, 21 | co 5512 | . . . . 5 |
23 | 11, 18, 22 | cif 3331 | . . . 4 |
24 | 8, 9, 23 | cif 3331 | . . 3 |
25 | 2, 3, 4, 5, 24 | cmpt2 5514 | . 2 |
26 | 1, 25 | wceq 1243 | 1 |
Colors of variables: wff set class |
This definition is referenced by: expival 9257 |
Copyright terms: Public domain | W3C validator |