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| Description: The Null Set Axiom of ZF set theory: the empty set exists. Corollary 5.16 of [TakeutiZaring] p. 20. For the unabbreviated version, see ax-nul 2678. |
| Ref | Expression |
|---|---|
| 0ex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-nul 2678 |
. . . 4
| |
| 2 | 1 | zfnuleu 2675 |
. . 3
|
| 3 | eq0 2265 |
. . . 4
| |
| 4 | 3 | eubii 1364 |
. . 3
|
| 5 | 2, 4 | mpbir 190 |
. 2
|
| 6 | eueq 1888 |
. 2
| |
| 7 | 5, 6 | mpbir 190 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: class2set 2702 0elpw 2704 0nep0 2705 unidif0 2707 iin0 2708 notzfaus 2709 dtru 2740 zfpair 2745 opprc1b 2763 opprc3 2764 opthwiener 2770 unisn2 2839 onint0 2970 0elon 2985 nsuceq0 3016 onzsl 3080 snsn0non 3088 finds 3119 finds2 3121 tfinds2 3128 opthprc 3183 onnev 3204 xpexr 3425 fun0 3485 nfunv 3487 tz7.44-1 3867 1ne0 4080 el1o 4084 om0 4094 om0x 4096 map0e 4280 map0b 4281 map0 4282 0elixp 4298 en0 4358 ensn1 4359 en1 4361 2dom 4362 map1 4365 endisj 4371 pw2en 4380 0dom 4398 dom0 4399 0sdomg 4400 limensuci 4438 unifi 4484 inf3lemb 4534 infeq5 4545 dfom3 4554 r10 4575 scottex 4640 brdom3 4725 cardeq0 4756 unxpdom2 4768 sucxpdom 4769 cf0 4833 cfeq0 4837 cfsuc 4838 uncdadom 4844 cdaun 4845 pm110.643 4846 cdaen 4847 cda0en 4848 cda1en 4849 xp1en 4850 cdacomen 4852 cdaassen 4853 mapcdaen 4855 cdadom1 4856 axpowndlem3 4874 indpi 4957 acdc3lem 7379 acdc2lem1 7381 acdclem 7387 alephadd 7475 sn0top 7540 indistop 7541 indistps 7546 0met 7713 bcth 7914 symggrp 8675 moec 8716 intprd 8726 efilcp 8795 fisub 8797 efilcp2 8800 cnfilca 8801 relrded 8869 0alg 8883 0ded 8884 0cat 8885 relrcat 8890 hgrablkcard 8956 emhgrat 8957 0hgra 8958 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-4 951 ax-5 952 ax-6 953 ax-7 954 ax-gen 955 ax-8 1101 ax-9 1102 ax-10 1103 ax-12 1104 ax-14 1108 ax-11 1180 ax-17 1190 ax-16 1194 ax-11o 1202 ax-ext 1436 ax-nul 2678 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 957 df-sb 1155 df-eu 1359 df-mo 1360 df-clab 1441 df-cleq 1446 df-clel 1449 df-ne 1563 df-v 1787 df-dif 2020 df-nul 2252 |