Description: Hilbert lattice join is the least upper bound of two elements (one direction of chlubi ). (Contributed by NM, 15-Oct-1999) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | ch0le.1 | |- A e. CH |
|
chjcl.2 | |- B e. CH |
||
chlub.1 | |- C e. CH |
||
Assertion | chlubii | |- ( ( A C_ C /\ B C_ C ) -> ( A vH B ) C_ C ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ch0le.1 | |- A e. CH |
|
2 | chjcl.2 | |- B e. CH |
|
3 | chlub.1 | |- C e. CH |
|
4 | 1 2 3 | chlubi | |- ( ( A C_ C /\ B C_ C ) <-> ( A vH B ) C_ C ) |
5 | 4 | biimpi | |- ( ( A C_ C /\ B C_ C ) -> ( A vH B ) C_ C ) |