Description: Second Peano postulate for an upper set of integers. (Contributed by Mario Carneiro, 26-Dec-2013)
Ref | Expression | ||
---|---|---|---|
Hypothesis | peano2uzs.1 | |
|
Assertion | peano2uzs | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | peano2uzs.1 | |
|
2 | peano2uz | |
|
3 | 2 1 | eleqtrrdi | |
4 | 3 1 | eleq2s | |