Description: Hilbert lattice contraposition law. (Contributed by NM, 15-Oct-1999) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | ch0le.1 | |
|
chjcl.2 | |
||
Assertion | chsscon2i | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ch0le.1 | |
|
2 | chjcl.2 | |
|
3 | 1 | chssii | |
4 | 2 | chssii | |
5 | occon3 | |
|
6 | 3 4 5 | mp2an | |