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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 6939 | . . . 4 ⊢ ≈ Er V | |
| 2 | 1 | a1i 9 | . . 3 ⊢ (⊤ → ≈ Er V) |
| 3 | 2 | ertr 6703 | . 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 2799 class class class wbr 4083 Er wer 6685 ≈ cen 6893 |
| 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 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 |
| 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 2801 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-id 4384 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-rn 4730 df-res 4731 df-ima 4732 df-fun 5320 df-fn 5321 df-f 5322 df-f1 5323 df-fo 5324 df-f1o 5325 df-er 6688 df-en 6896 |
| This theorem is referenced by: entri 6946 en2sn 6974 xpsnen2g 6996 enen1 7009 enen2 7010 ssenen 7020 phplem4 7024 snnen2og 7028 php5dom 7032 phplem4on 7037 dif1en 7049 dif1enen 7050 fisbth 7053 diffisn 7063 fidcen 7069 eqsndc 7076 exmidpw2en 7085 unsnfidcex 7093 unsnfidcel 7094 f1finf1o 7125 en1eqsn 7126 endjusym 7274 carden2bex 7373 pm54.43 7374 pr2ne 7376 djuen 7404 djuenun 7405 djuassen 7410 frecfzen2 10661 uzennn 10670 hashunlem 11038 hashxp 11061 1nprm 12651 hashdvds 12758 4sqlem11 12939 unennn 12983 ennnfonelemen 13007 ennnfonelemim 13010 exmidunben 13012 ctinfom 13014 ctinf 13016 umgredgnlp 15965 usgrsizedgen 16026 upgr2wlkdc 16116 pwf1oexmid 16424 nnnninfen 16447 |
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