| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > entr | GIF version | ||
| 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 7070 | . . . 4 ⊢ ≈ Er V | |
| 2 | 1 | a1i 9 | . . 3 ⊢ (⊤ → ≈ Er V) |
| 3 | 2 | ertr 6826 | . 2 ⊢ (⊤ → ((𝐴 ≈ 𝐵 ∧ 𝐵 ≈ 𝐶) → 𝐴 ≈ 𝐶)) |
| 4 | 3 | mptru 1411 | 1 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐵 ≈ 𝐶) → 𝐴 ≈ 𝐶) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ⊤wtru 1403 Vcvv 2821 class class class wbr 4131 Er wer 6808 ≈ cen 7024 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4132 df-opab 4194 df-id 4440 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 df-fo 5386 df-f1o 5387 df-er 6811 df-en 7027 |
| This theorem is used by: entri 7077 en2sn 7106 xpsnen2g 7131 enen1 7144 enen2 7145 ssenen 7156 phplem4 7160 snnen2og 7164 php5dom 7168 phplem4on 7173 dif1en 7187 dif1enen 7188 fisbth 7191 diffisn 7201 fidcen 7207 eqsndc 7214 exmidpw2en 7223 unsnfidcex 7231 unsnfidcel 7232 f1finf1o 7269 en1eqsn 7270 2omapfi 7326 endjusym 7442 carden2bex 7541 pm54.43 7542 pr2ne 7544 djuen 7573 djuenun 7574 djuassen 7579 frecfzen2 10885 uzennn 10894 hashunlem 11266 hashxp 11289 1nprm 12917 hashdvds 13028 4sqlem11 13209 unennn 13346 ennnfonelemen 13370 ennnfonelemim 13373 exmidunben 13375 ctinfom 13377 ctinf 13379 umgredgnlp 16598 usgrsizedgen 16659 upgr2wlkdc 16823 pwf1oexmid 17234 nnnninfen 17270 |
| Copyright terms: Public domain | W3C validator |