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| Mirrors > Home > ILE Home > Th. List > rpaddcld | GIF version | ||
| Description: Closure law for addition of positive reals. Part of Axiom 7 of [Apostol] p. 20. (Contributed by Mario Carneiro, 28-May-2016.) |
| Ref | Expression |
|---|---|
| rpred.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ+) |
| rpaddcld.1 | ⊢ (𝜑 → 𝐵 ∈ ℝ+) |
| Ref | Expression |
|---|---|
| rpaddcld | ⊢ (𝜑 → (𝐴 + 𝐵) ∈ ℝ+) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rpred.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ+) | |
| 2 | rpaddcld.1 | . 2 ⊢ (𝜑 → 𝐵 ∈ ℝ+) | |
| 3 | rpaddcl 9801 | . 2 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐵 ∈ ℝ+) → (𝐴 + 𝐵) ∈ ℝ+) | |
| 4 | 1, 2, 3 | syl2anc 411 | 1 ⊢ (𝜑 → (𝐴 + 𝐵) ∈ ℝ+) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2176 (class class class)co 5946 + caddc 7930 ℝ+crp 9777 |
| 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 711 ax-5 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-13 2178 ax-14 2179 ax-ext 2187 ax-sep 4163 ax-pow 4219 ax-pr 4254 ax-un 4481 ax-setind 4586 ax-cnex 8018 ax-resscn 8019 ax-1cn 8020 ax-1re 8021 ax-icn 8022 ax-addcl 8023 ax-addrcl 8024 ax-mulcl 8025 ax-addcom 8027 ax-addass 8029 ax-i2m1 8032 ax-0id 8035 ax-rnegex 8036 ax-pre-lttrn 8041 ax-pre-ltadd 8043 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1484 df-sb 1786 df-eu 2057 df-mo 2058 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-ne 2377 df-nel 2472 df-ral 2489 df-rex 2490 df-rab 2493 df-v 2774 df-dif 3168 df-un 3170 df-in 3172 df-ss 3179 df-pw 3618 df-sn 3639 df-pr 3640 df-op 3642 df-uni 3851 df-br 4046 df-opab 4107 df-xp 4682 df-iota 5233 df-fv 5280 df-ov 5949 df-pnf 8111 df-mnf 8112 df-ltxr 8114 df-rp 9778 |
| This theorem is referenced by: resqrexlemnm 11362 iooref1o 16010 |
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