Description: Zero is in the right set of any negative number. (Contributed by Scott Fenton, 13-Mar-2025)
Ref | Expression | ||
---|---|---|---|
Hypotheses | 0elright.1 | |
|
0elright.2 | |
||
Assertion | 0elright | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0elright.1 | |
|
2 | 0elright.2 | |
|
3 | sltne | |
|
4 | 1 2 3 | syl2anc | |
5 | 4 | necomd | |
6 | 1 5 | 0elold | |
7 | breq2 | |
|
8 | rightval | |
|
9 | 7 8 | elrab2 | |
10 | 6 2 9 | sylanbrc | |