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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 6952 | . . . 4 ⊢ ≈ Er V | |
| 2 | 1 | a1i 9 | . . 3 ⊢ (⊤ → ≈ Er V) |
| 3 | 2 | ertr 6716 | . 2 ⊢ (⊤ → ((𝐴 ≈ 𝐵 ∧ 𝐵 ≈ 𝐶) → 𝐴 ≈ 𝐶)) |
| 4 | 3 | mptru 1406 | 1 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐵 ≈ 𝐶) → 𝐴 ≈ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ⊤wtru 1398 Vcvv 2802 class class class wbr 4088 Er wer 6698 ≈ cen 6906 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-opab 4151 df-id 4390 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-rn 4736 df-res 4737 df-ima 4738 df-fun 5328 df-fn 5329 df-f 5330 df-f1 5331 df-fo 5332 df-f1o 5333 df-er 6701 df-en 6909 |
| This theorem is referenced by: entri 6959 en2sn 6987 xpsnen2g 7012 enen1 7025 enen2 7026 ssenen 7036 phplem4 7040 snnen2og 7044 php5dom 7048 phplem4on 7053 dif1en 7067 dif1enen 7068 fisbth 7071 diffisn 7081 fidcen 7087 eqsndc 7094 exmidpw2en 7103 unsnfidcex 7111 unsnfidcel 7112 f1finf1o 7145 en1eqsn 7146 endjusym 7294 carden2bex 7393 pm54.43 7394 pr2ne 7396 djuen 7425 djuenun 7426 djuassen 7431 frecfzen2 10688 uzennn 10697 hashunlem 11066 hashxp 11089 1nprm 12685 hashdvds 12792 4sqlem11 12973 unennn 13017 ennnfonelemen 13041 ennnfonelemim 13044 exmidunben 13046 ctinfom 13048 ctinf 13050 umgredgnlp 16002 usgrsizedgen 16063 upgr2wlkdc 16227 pwf1oexmid 16600 nnnninfen 16623 |
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