Description: Two ways of expressing a certain ternary connective. Note the respective positions of the three formulas on each side of the biconditional. (Contributed by BJ, 6-Oct-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-andnotim |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imor | ||
2 | iman | ||
3 | 2 | biimpri | |
4 | 3 | orim1i | |
5 | 1 4 | sylbi | |
6 | pm2.24 | ||
7 | 6 | imim2i | |
8 | 7 | impd | |
9 | ax-1 | ||
10 | 8 9 | jaoi | |
11 | 5 10 | impbii |