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Mirrors > Home > MPE Home > Th. List > ex-pss | Structured version Visualization version GIF version |
Description: Example for df-pss 3900. Example by David A. Wheeler. (Contributed by Mario Carneiro, 6-May-2015.) |
Ref | Expression |
---|---|
ex-pss | ⊢ {1, 2} ⊊ {1, 2, 3} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ex-ss 28212 | . 2 ⊢ {1, 2} ⊆ {1, 2, 3} | |
2 | 3ex 11707 | . . . . 5 ⊢ 3 ∈ V | |
3 | 2 | tpid3 4669 | . . . 4 ⊢ 3 ∈ {1, 2, 3} |
4 | 1re 10630 | . . . . . 6 ⊢ 1 ∈ ℝ | |
5 | 1lt3 11798 | . . . . . 6 ⊢ 1 < 3 | |
6 | 4, 5 | gtneii 10741 | . . . . 5 ⊢ 3 ≠ 1 |
7 | 2re 11699 | . . . . . 6 ⊢ 2 ∈ ℝ | |
8 | 2lt3 11797 | . . . . . 6 ⊢ 2 < 3 | |
9 | 7, 8 | gtneii 10741 | . . . . 5 ⊢ 3 ≠ 2 |
10 | 6, 9 | nelpri 4554 | . . . 4 ⊢ ¬ 3 ∈ {1, 2} |
11 | nelne1 3083 | . . . 4 ⊢ ((3 ∈ {1, 2, 3} ∧ ¬ 3 ∈ {1, 2}) → {1, 2, 3} ≠ {1, 2}) | |
12 | 3, 10, 11 | mp2an 691 | . . 3 ⊢ {1, 2, 3} ≠ {1, 2} |
13 | 12 | necomi 3041 | . 2 ⊢ {1, 2} ≠ {1, 2, 3} |
14 | df-pss 3900 | . 2 ⊢ ({1, 2} ⊊ {1, 2, 3} ↔ ({1, 2} ⊆ {1, 2, 3} ∧ {1, 2} ≠ {1, 2, 3})) | |
15 | 1, 13, 14 | mpbir2an 710 | 1 ⊢ {1, 2} ⊊ {1, 2, 3} |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∈ wcel 2111 ≠ wne 2987 ⊆ wss 3881 ⊊ wpss 3882 {cpr 4527 {ctp 4529 1c1 10527 2c2 11680 3c3 11681 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-po 5438 df-so 5439 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-er 8272 df-en 8493 df-dom 8494 df-sdom 8495 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-2 11688 df-3 11689 |
This theorem is referenced by: (None) |
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