Mathbox for Wolf Lammen |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > wl-lem-exsb | Structured version Visualization version Unicode version |
Description: This theorem provides a basic working step in proving theorems about or . (Contributed by Wolf Lammen, 3-Oct-2019.) |
Ref | Expression |
---|---|
wl-lem-exsb |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax12v2 2049 | . 2 | |
2 | sp 2053 | . . 3 | |
3 | 2 | com12 32 | . 2 |
4 | 1, 3 | impbid 202 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wal 1481 |
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-12 2047 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 |
This theorem is referenced by: (None) |
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