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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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