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| Description: Transitivity of equinumerosity. Theorem 3 of [Suppes] p. 92. (Contributed by NM, 9-Jun-1998.) |
| Ref | Expression |
|---|---|
| entr | ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐵 ≈ 𝐶) → 𝐴 ≈ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ener 6948 | . . . 4 ⊢ ≈ Er V | |
| 2 | 1 | a1i 9 | . . 3 ⊢ (⊤ → ≈ Er V) |
| 3 | 2 | ertr 6712 | . 2 ⊢ (⊤ → ((𝐴 ≈ 𝐵 ∧ 𝐵 ≈ 𝐶) → 𝐴 ≈ 𝐶)) |
| 4 | 3 | mptru 1404 | 1 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐵 ≈ 𝐶) → 𝐴 ≈ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ⊤wtru 1396 Vcvv 2800 class class class wbr 4086 Er wer 6694 ≈ cen 6902 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2802 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 df-er 6697 df-en 6905 |
| This theorem is referenced by: entri 6955 en2sn 6983 xpsnen2g 7008 enen1 7021 enen2 7022 ssenen 7032 phplem4 7036 snnen2og 7040 php5dom 7044 phplem4on 7049 dif1en 7061 dif1enen 7062 fisbth 7065 diffisn 7075 fidcen 7081 eqsndc 7088 exmidpw2en 7097 unsnfidcex 7105 unsnfidcel 7106 f1finf1o 7137 en1eqsn 7138 endjusym 7286 carden2bex 7385 pm54.43 7386 pr2ne 7388 djuen 7416 djuenun 7417 djuassen 7422 frecfzen2 10679 uzennn 10688 hashunlem 11057 hashxp 11080 1nprm 12676 hashdvds 12783 4sqlem11 12964 unennn 13008 ennnfonelemen 13032 ennnfonelemim 13035 exmidunben 13037 ctinfom 13039 ctinf 13041 umgredgnlp 15991 usgrsizedgen 16052 upgr2wlkdc 16172 pwf1oexmid 16536 nnnninfen 16559 |
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