Description: 'Less than or equal to' implies 'less than' is not 'equals'. (Contributed by Mario Carneiro, 27-May-2016)
Ref | Expression | ||
---|---|---|---|
Hypotheses | ltd.1 | |
|
ltd.2 | |
||
leltned.3 | |
||
Assertion | leltned | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltd.1 | |
|
2 | ltd.2 | |
|
3 | leltned.3 | |
|
4 | leltne | |
|
5 | 1 2 3 4 | syl3anc | |