Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > bibi2i | Unicode version |
Description: Inference adding a biconditional to the left in an equivalence. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 7-May-2011.) (Proof shortened by Wolf Lammen, 16-May-2013.) |
Ref | Expression |
---|---|
bibi.a |
Ref | Expression |
---|---|
bibi2i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 | . . 3 | |
2 | bibi.a | . . 3 | |
3 | 1, 2 | syl6bb 195 | . 2 |
4 | id 19 | . . 3 | |
5 | 4, 2 | syl6bbr 197 | . 2 |
6 | 3, 5 | impbii 125 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: bibi1i 227 bibi12i 228 bibi2d 231 pm4.71r 387 sblbis 1931 sbrbif 1933 abeq2 2246 abid2f 2304 necon4biddc 2381 pm13.183 2817 disj3 3410 euabsn2 3587 a9evsep 4045 inex1 4057 zfpair2 4127 sucel 4327 bdinex1 13086 bj-zfpair2 13097 bj-d0clsepcl 13112 |
Copyright terms: Public domain | W3C validator |