Description: Lemma for 3OA (weak) orthoarguesian law. (Contributed by NM, 19-Oct-1999) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | 3oalem1.1 | |
|
3oalem1.2 | |
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3oalem1.3 | |
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3oalem1.4 | |
||
Assertion | 3oalem1 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3oalem1.1 | |
|
2 | 3oalem1.2 | |
|
3 | 3oalem1.3 | |
|
4 | 3oalem1.4 | |
|
5 | 1 | cheli | |
6 | 3 | cheli | |
7 | 5 6 | anim12i | |
8 | hvaddcl | |
|
9 | eleq1 | |
|
10 | 8 9 | syl5ibrcom | |
11 | 10 | imdistani | |
12 | 7 11 | sylan | |
13 | 2 | cheli | |
14 | 4 | cheli | |
15 | 13 14 | anim12i | |
16 | 15 | adantr | |
17 | 12 16 | anim12i | |