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| Mirrors > Home > ILE Home > Th. List > fsumzcl2 | GIF version | ||
| Description: A finite sum with integer summands is an integer. (Contributed by Alexander van der Vekens, 31-Aug-2018.) |
| Ref | Expression |
|---|---|
| fsumzcl2 | ⊢ ((𝐴 ∈ Fin ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ) → Σ𝑘 ∈ 𝐴 𝐵 ∈ ℤ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfcv 2374 | . . 3 ⊢ Ⅎ𝑥𝐵 | |
| 2 | nfcsb1v 3160 | . . 3 ⊢ Ⅎ𝑘⦋𝑥 / 𝑘⦌𝐵 | |
| 3 | csbeq1a 3136 | . . 3 ⊢ (𝑘 = 𝑥 → 𝐵 = ⦋𝑥 / 𝑘⦌𝐵) | |
| 4 | 1, 2, 3 | cbvsumi 11923 | . 2 ⊢ Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑥 ∈ 𝐴 ⦋𝑥 / 𝑘⦌𝐵 |
| 5 | simpl 109 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ) → 𝐴 ∈ Fin) | |
| 6 | rspcsbela 3187 | . . . . . 6 ⊢ ((𝑥 ∈ 𝐴 ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ) → ⦋𝑥 / 𝑘⦌𝐵 ∈ ℤ) | |
| 7 | 6 | expcom 116 | . . . . 5 ⊢ (∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ → (𝑥 ∈ 𝐴 → ⦋𝑥 / 𝑘⦌𝐵 ∈ ℤ)) |
| 8 | 7 | adantl 277 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ) → (𝑥 ∈ 𝐴 → ⦋𝑥 / 𝑘⦌𝐵 ∈ ℤ)) |
| 9 | 8 | imp 124 | . . 3 ⊢ (((𝐴 ∈ Fin ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ) ∧ 𝑥 ∈ 𝐴) → ⦋𝑥 / 𝑘⦌𝐵 ∈ ℤ) |
| 10 | 5, 9 | fsumzcl 11964 | . 2 ⊢ ((𝐴 ∈ Fin ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ) → Σ𝑥 ∈ 𝐴 ⦋𝑥 / 𝑘⦌𝐵 ∈ ℤ) |
| 11 | 4, 10 | eqeltrid 2318 | 1 ⊢ ((𝐴 ∈ Fin ∧ ∀𝑘 ∈ 𝐴 𝐵 ∈ ℤ) → Σ𝑘 ∈ 𝐴 𝐵 ∈ ℤ) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2202 ∀wral 2510 ⦋csb 3127 Fincfn 6909 ℤcz 9479 Σcsu 11914 |
| 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 619 ax-in2 620 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-coll 4204 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-iinf 4686 ax-cnex 8123 ax-resscn 8124 ax-1cn 8125 ax-1re 8126 ax-icn 8127 ax-addcl 8128 ax-addrcl 8129 ax-mulcl 8130 ax-mulrcl 8131 ax-addcom 8132 ax-mulcom 8133 ax-addass 8134 ax-mulass 8135 ax-distr 8136 ax-i2m1 8137 ax-0lt1 8138 ax-1rid 8139 ax-0id 8140 ax-rnegex 8141 ax-precex 8142 ax-cnre 8143 ax-pre-ltirr 8144 ax-pre-ltwlin 8145 ax-pre-lttrn 8146 ax-pre-apti 8147 ax-pre-ltadd 8148 ax-pre-mulgt0 8149 ax-pre-mulext 8150 ax-arch 8151 ax-caucvg 8152 |
| This theorem depends on definitions: df-bi 117 df-dc 842 df-3or 1005 df-3an 1006 df-tru 1400 df-fal 1403 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-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-reu 2517 df-rmo 2518 df-rab 2519 df-v 2804 df-sbc 3032 df-csb 3128 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-if 3606 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-int 3929 df-iun 3972 df-br 4089 df-opab 4151 df-mpt 4152 df-tr 4188 df-id 4390 df-po 4393 df-iso 4394 df-iord 4463 df-on 4465 df-ilim 4466 df-suc 4468 df-iom 4689 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-iota 5286 df-fun 5328 df-fn 5329 df-f 5330 df-f1 5331 df-fo 5332 df-f1o 5333 df-fv 5334 df-isom 5335 df-riota 5971 df-ov 6021 df-oprab 6022 df-mpo 6023 df-1st 6303 df-2nd 6304 df-recs 6471 df-irdg 6536 df-frec 6557 df-1o 6582 df-oadd 6586 df-er 6702 df-en 6910 df-dom 6911 df-fin 6912 df-pnf 8216 df-mnf 8217 df-xr 8218 df-ltxr 8219 df-le 8220 df-sub 8352 df-neg 8353 df-reap 8755 df-ap 8762 df-div 8853 df-inn 9144 df-2 9202 df-3 9203 df-4 9204 df-n0 9403 df-z 9480 df-uz 9756 df-q 9854 df-rp 9889 df-fz 10244 df-fzo 10378 df-seqfrec 10710 df-exp 10801 df-ihash 11038 df-cj 11403 df-re 11404 df-im 11405 df-rsqrt 11559 df-abs 11560 df-clim 11840 df-sumdc 11915 |
| This theorem is referenced by: modfsummodlemstep 12019 |
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