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| Mirrors > Home > ILE Home > Th. List > letrd | Unicode version | ||
| Description: Transitive law deduction for 'less than or equal to'. (Contributed by NM, 20-May-2005.) | 
| Ref | Expression | 
|---|---|
| ltd.1 | 
 | 
| ltd.2 | 
 | 
| letrd.3 | 
 | 
| letrd.4 | 
 | 
| letrd.5 | 
 | 
| Ref | Expression | 
|---|---|
| letrd | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | letrd.4 | 
. 2
 | |
| 2 | letrd.5 | 
. 2
 | |
| 3 | ltd.1 | 
. . 3
 | |
| 4 | ltd.2 | 
. . 3
 | |
| 5 | letrd.3 | 
. . 3
 | |
| 6 | letr 8109 | 
. . 3
 | |
| 7 | 3, 4, 5, 6 | syl3anc 1249 | 
. 2
 | 
| 8 | 1, 2, 7 | mp2and 433 | 
1
 | 
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