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Mirrors > Home > MPE Home > Th. List > 19.21-2OLD | Structured version Visualization version Unicode version |
Description: Obsolete proof of 19.21-2 2078 as of 6-Oct-2021. (Contributed by NM, 4-Feb-2005.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
19.21-2OLD.1 | |
19.21-2OLD.2 |
Ref | Expression |
---|---|
19.21-2OLD |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.21-2OLD.2 | . . . 4 | |
2 | 1 | 19.21OLD 2214 | . . 3 |
3 | 2 | albii 1747 | . 2 |
4 | 19.21-2OLD.1 | . . 3 | |
5 | 4 | 19.21OLD 2214 | . 2 |
6 | 3, 5 | bitri 264 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wal 1481 wnfOLD 1709 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-10 2019 ax-12 2047 |
This theorem depends on definitions: df-bi 197 df-ex 1705 df-nfOLD 1721 |
This theorem is referenced by: (None) |
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