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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-df-nul | Structured version Visualization version Unicode version |
Description: Alternate definition of the empty class/set. (Contributed by BJ, 30-Nov-2019.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
bj-df-nul |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3919 | . . 3 | |
2 | 1 | bifal 1497 | . 2 |
3 | 2 | bj-abbi2i 32776 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wceq 1483 wfal 1488 wcel 1990 cab 2608 c0 3915 |
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-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-fal 1489 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-v 3202 df-dif 3577 df-nul 3916 |
This theorem is referenced by: (None) |
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