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Mirrors > Home > MPE Home > Th. List > Mathboxes > df3o3 | Structured version Visualization version GIF version |
Description: Ordinal 3, fully expanded. (Contributed by RP, 8-Jul-2021.) |
Ref | Expression |
---|---|
df3o3 | ⊢ 3o = {∅, {∅}, {∅, {∅}}} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-3o 8507 | . 2 ⊢ 3o = suc 2o | |
2 | df2o2 8514 | . . . 4 ⊢ 2o = {∅, {∅}} | |
3 | 2 | sneqi 4642 | . . . 4 ⊢ {2o} = {{∅, {∅}}} |
4 | 2, 3 | uneq12i 4176 | . . 3 ⊢ (2o ∪ {2o}) = ({∅, {∅}} ∪ {{∅, {∅}}}) |
5 | df-suc 6392 | . . 3 ⊢ suc 2o = (2o ∪ {2o}) | |
6 | df-tp 4636 | . . 3 ⊢ {∅, {∅}, {∅, {∅}}} = ({∅, {∅}} ∪ {{∅, {∅}}}) | |
7 | 4, 5, 6 | 3eqtr4i 2773 | . 2 ⊢ suc 2o = {∅, {∅}, {∅, {∅}}} |
8 | 1, 7 | eqtri 2763 | 1 ⊢ 3o = {∅, {∅}, {∅, {∅}}} |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∪ cun 3961 ∅c0 4339 {csn 4631 {cpr 4633 {ctp 4635 suc csuc 6388 2oc2o 8499 3oc3o 8500 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-ext 2706 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-tru 1540 df-fal 1550 df-ex 1777 df-sb 2063 df-clab 2713 df-cleq 2727 df-clel 2814 df-v 3480 df-dif 3966 df-un 3968 df-nul 4340 df-sn 4632 df-pr 4634 df-tp 4636 df-suc 6392 df-1o 8505 df-2o 8506 df-3o 8507 |
This theorem is referenced by: (None) |
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