Description: Membership of an integer greater than 1 decreased by 1 in a 1-based finite set of sequential integers. (Contributed by Alexander van der Vekens, 14-Sep-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | ige2m1fz1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1e2m1 | |
|
2 | 1 | a1i | |
3 | 2 | oveq2d | |
4 | 2nn | |
|
5 | uzsubsubfz1 | |
|
6 | 4 5 | mpan | |
7 | 3 6 | eqeltrd | |