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| Description: Introduction of a disjunct. Axiom *1.3 of [WhiteheadRussell] p. 96. |
| Ref | Expression |
|---|---|
| olc |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-1 4 |
. 2
| |
| 2 | 1 | orrd 250 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: olci 293 olcd 295 olcs 297 pm2.07 298 pm2.46 300 pm2.41 369 jaob 467 pm4.72 703 oibabs 716 pm5.75OLD 822 dedlemb 839 dedlembOLD 840 prlem2 850 dn1 855 dn1OLD 856 19.33 1443 19.33b 1444 19.33bOLD 1445 dfsb2 1595 mooran2 1824 euor2 1839 euor2OLD 1840 undif3 2854 undif4 2930 ordssun 3769 ordequn 3770 sucprcreg 5703 rankxplim3 5825 ltapr 6303 ltpnf 6717 mnflt 6718 mnfltpnf 6719 zaddcl 7374 zmulcl 7389 expeq0 7828 bcpasci 8221 infxpidmlem3 8823 0top 8905 efif1lem5 10088 usinuniop 10341 pjthlem11 10862 dfon2lem4 13852 frxp 13951 sltsgn1 14002 sltsgn2 14003 meran1 14235 facrm 14290 nxtor 14312 subtopsin2 14907 partarelt1 15273 alexsublem3 15439 isufil2 15565 prtlem90 16246 19.33-2 16335 undif3VD 16706 paddcl 17303 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 |
| This theorem depends on definitions: df-bi 164 df-or 241 |