Description: Split the first element of a finite set of sequential nonnegative integers. (Contributed by AV, 12-Sep-2025)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | fz0dif1 | |- ( N e. NN0 -> ( ( 0 ... N ) \ { 0 } ) = ( 1 ... N ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elnn0uz | |- ( N e. NN0 <-> N e. ( ZZ>= ` 0 ) ) |
|
| 2 | fzdif1 | |- ( N e. ( ZZ>= ` 0 ) -> ( ( 0 ... N ) \ { 0 } ) = ( ( 0 + 1 ) ... N ) ) |
|
| 3 | 1 2 | sylbi | |- ( N e. NN0 -> ( ( 0 ... N ) \ { 0 } ) = ( ( 0 + 1 ) ... N ) ) |
| 4 | 0p1e1 | |- ( 0 + 1 ) = 1 |
|
| 5 | 4 | oveq1i | |- ( ( 0 + 1 ) ... N ) = ( 1 ... N ) |
| 6 | 3 5 | eqtrdi | |- ( N e. NN0 -> ( ( 0 ... N ) \ { 0 } ) = ( 1 ... N ) ) |