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| Mirrors > Home > ILE Home > Th. List > lttri | GIF version | ||
| Description: 'Less than' is transitive. Theorem I.17 of [Apostol] p. 20. (Contributed by NM, 14-May-1999.) |
| Ref | Expression |
|---|---|
| lt.1 | ⊢ 𝐴 ∈ ℝ |
| lt.2 | ⊢ 𝐵 ∈ ℝ |
| lt.3 | ⊢ 𝐶 ∈ ℝ |
| Ref | Expression |
|---|---|
| lttri | ⊢ ((𝐴 < 𝐵 ∧ 𝐵 < 𝐶) → 𝐴 < 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | lt.1 | . 2 ⊢ 𝐴 ∈ ℝ | |
| 2 | lt.2 | . 2 ⊢ 𝐵 ∈ ℝ | |
| 3 | lt.3 | . 2 ⊢ 𝐶 ∈ ℝ | |
| 4 | lttr 8102 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → ((𝐴 < 𝐵 ∧ 𝐵 < 𝐶) → 𝐴 < 𝐶)) | |
| 5 | 1, 2, 3, 4 | mp3an 1348 | 1 ⊢ ((𝐴 < 𝐵 ∧ 𝐵 < 𝐶) → 𝐴 < 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2167 class class class wbr 4034 ℝcr 7880 < clt 8063 |
| 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-in1 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-sep 4152 ax-pow 4208 ax-pr 4243 ax-un 4469 ax-setind 4574 ax-cnex 7972 ax-resscn 7973 ax-pre-lttrn 7995 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-rab 2484 df-v 2765 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-br 4035 df-opab 4096 df-xp 4670 df-pnf 8065 df-mnf 8066 df-ltxr 8068 |
| This theorem is referenced by: 1lt3 9164 2lt4 9166 1lt4 9167 3lt5 9169 2lt5 9170 1lt5 9171 4lt6 9173 3lt6 9174 2lt6 9175 1lt6 9176 5lt7 9178 4lt7 9179 3lt7 9180 2lt7 9181 1lt7 9182 6lt8 9184 5lt8 9185 4lt8 9186 3lt8 9187 2lt8 9188 1lt8 9189 7lt9 9191 6lt9 9192 5lt9 9193 4lt9 9194 3lt9 9195 2lt9 9196 1lt9 9197 8lt10 9590 7lt10 9591 6lt10 9592 5lt10 9593 4lt10 9594 3lt10 9595 2lt10 9596 1lt10 9597 sincos2sgn 11933 cos12dec 11935 epos 11948 ene1 11952 eap1 11953 reeff1o 15019 pipos 15034 pigt3 15090 apdiff 15702 |
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