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Related theorems GIF version |
| Description: Define 'less than or equal to'. See df-le1 130 for the other direction. |
| Ref | Expression |
|---|---|
| df-le2.1 | a ≤ b |
| Ref | Expression |
|---|---|
| df-le2 | (a ∪ b) = b |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wva | . . 3 term a | |
| 2 | wvb | . . 3 term b | |
| 3 | 1, 2 | wo 6 | . 2 term (a ∪ b) |
| 4 | 3, 2 | wb 1 | 1 wff (a ∪ b) = b |
| Colors of variables: term |
| This definition is referenced by: df2le2 136 letr 137 bltr 138 lebi 145 ler 149 leror 152 lecon 154 wwoml2 212 sklem 230 nom13 310 nom14 311 nom15 312 k1-4 359 oml2 451 gsth 489 cmtr1com 493 i0cmtrcom 495 df2i3 498 oi3ai3 503 i3con 551 i3orlem6 557 ud3lem1c 568 ud3lem3 576 ud4lem1c 579 ud4lem1 581 ud4lem3b 584 ud5lem1 589 u3lemoa 622 u2lemona 626 u3lemona 627 u4lemona 628 u5lemona 629 u1lemob 630 u3lemob 632 u4lemob 633 u5lemob 634 u3lemonb 637 u4lemonb 638 u5lemonb 639 u4lem1 737 u4lem2 747 u4lem5 764 u4lem6 768 u24lem 770 u3lem13a 789 u3lem13b 790 biao 799 test 802 test2 803 3vth3 806 3vth6 809 orbi 842 elimconslem 867 elimcons 868 elimcons2 869 comanblem1 870 mhlem 876 e2ast2 894 gomaex3lem1 914 oaidlem2 931 oaidlem2g 932 oa3-6lem 980 oa3-u1lem 985 oa3-u2lem 986 oa3-u1 991 oa3-u2 992 oadistc0 1021 lem3.3.7i2e2 1063 lem3.3.7i3e2 1066 lem4.6.2e1 1079 lem4.6.6i1j0 1089 lem4.6.6i1j3 1091 lem4.6.6i2j0 1092 lem4.6.6i3j0 1095 lem4.6.6i4j0 1097 lem4.6.7 1100 |