Description: The index of the slot for the uniform set in an extensible structure is a positive integer. Formerly part of proof for tuslem . (Contributed by AV, 28-Oct-2024)
Ref | Expression | ||
---|---|---|---|
Assertion | unifndxnn | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unifndx | |
|
2 | 1nn0 | |
|
3 | 3nn | |
|
4 | 2 3 | decnncl | |
5 | 1 4 | eqeltri | |