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| Mirrors > Home > ILE Home > Th. List > lencl | Unicode version | ||
| Description: The length of a word is a nonnegative integer. This corresponds to the definition in Section 9.1 of [AhoHopUll] p. 318. (Contributed by Stefan O'Rear, 27-Aug-2015.) |
| Ref | Expression |
|---|---|
| lencl |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | iswrd 11108 |
. . 3
| |
| 2 | 1 | biimpi 120 |
. 2
|
| 3 | fnfzo0hash 11092 |
. . . 4
| |
| 4 | 3 | adantl 277 |
. . 3
|
| 5 | simprl 529 |
. . 3
| |
| 6 | 4, 5 | eqeltrd 2306 |
. 2
|
| 7 | 2, 6 | rexlimddv 2653 |
1
|
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