Users' Mathboxes Mathbox for Glauco Siliprandi < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  sge0pnfval Structured version   Visualization version   GIF version

Theorem sge0pnfval 47145
Description: If a term in the sum of nonnegative extended reals is +∞, then the value of the sum is +∞. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
Hypotheses
Ref Expression
sge0pnfval.x (𝜑𝑋𝑉)
sge0pnfval.f (𝜑𝐹:𝑋⟶(0[,]+∞))
sge0pnfval.pnf (𝜑 → +∞ ∈ ran 𝐹)
Assertion
Ref Expression
sge0pnfval (𝜑 → (Σ^𝐹) = +∞)

Proof of Theorem sge0pnfval
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 sge0pnfval.x . . 3 (𝜑𝑋𝑉)
2 sge0pnfval.f . . 3 (𝜑𝐹:𝑋⟶(0[,]+∞))
31, 2sge0vald 47141 . 2 (𝜑 → (Σ^𝐹) = if(+∞ ∈ ran 𝐹, +∞, sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦𝑥 (𝐹𝑦)), ℝ*, < )))
4 sge0pnfval.pnf . . 3 (𝜑 → +∞ ∈ ran 𝐹)
54iftrued 4497 . 2 (𝜑 → if(+∞ ∈ ran 𝐹, +∞, sup(ran (𝑥 ∈ (𝒫 𝑋 ∩ Fin) ↦ Σ𝑦𝑥 (𝐹𝑦)), ℝ*, < )) = +∞)
63, 5eqtrd 2800 1 (𝜑 → (Σ^𝐹) = +∞)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4   = wceq 1570  wcel 2146  cin 3905  ifcif 4489  𝒫 cpw 4564  cmpt 5194  ran crn 5664  wf 6536  cfv 6540  (class class class)co 7419  Fincfn 8949  supcsup 9407  0cc0 11115  +∞cpnf 11255  *cxr 11257   < clt 11258  [,]cicc 13391  Σcsu 15761  Σ^csumge0 47134
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-rep 5240  ax-sep 5259  ax-nul 5271  ax-pow 5338  ax-pr 5406  ax-un 7742  ax-cnex 11171  ax-resscn 11172  ax-pre-lttri 11189  ax-pre-lttrn 11190
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-nel 3067  df-ral 3082  df-rex 3092  df-rmo 3371  df-reu 3372  df-rab 3419  df-v 3459  df-sbc 3747  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-iun 4960  df-br 5112  df-opab 5176  df-mpt 5195  df-id 5558  df-po 5571  df-so 5572  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-pred 6306  df-iota 6496  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-ov 7422  df-oprab 7423  df-mpo 7424  df-frecs 8284  df-wrecs 8315  df-recs 8364  df-rdg 8403  df-er 8700  df-en 8950  df-dom 8951  df-sdom 8952  df-sup 9409  df-pnf 11260  df-mnf 11261  df-xr 11262  df-ltxr 11263  df-seq 14056  df-sum 15762  df-sumge0 47135
This theorem is used by:  sge0sn  47151  sge0tsms  47152  sge0cl  47153  sge0f1o  47154  sge0rern  47160  sge0supre  47161  sge0sup  47163  sge0pr  47166  sge0le  47179  sge0split  47181  sge0iunmpt  47190  sge0pnfmpt  47217
  Copyright terms: Public domain W3C validator