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| Mirrors > Home > ILE Home > Th. List > eluz2 | Unicode version | ||
| Description: Membership in an upper
set of integers. We use the fact that a
function's value (under our function value definition) is empty outside
of its domain to show |
| Ref | Expression |
|---|---|
| eluz2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluzel2 9606 |
. 2
| |
| 2 | simp1 999 |
. 2
| |
| 3 | eluz1 9605 |
. . . 4
| |
| 4 | ibar 301 |
. . . 4
| |
| 5 | 3, 4 | bitrd 188 |
. . 3
|
| 6 | 3anass 984 |
. . 3
| |
| 7 | 5, 6 | bitr4di 198 |
. 2
|
| 8 | 1, 2, 7 | pm5.21nii 705 |
1
|
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