Theorem meaf 44940

Description: A measure is a function that maps to nonnegative extended reals. (Contributed by Glauco Siliprandi, 17-Aug-2020.)

Hypotheses

Ref	Expression
meaf.m	⊢ (𝜑 → 𝑀 ∈ Meas)
meaf.s	⊢ 𝑆 = dom 𝑀

Assertion

Ref	Expression
meaf	⊢ (𝜑 → 𝑀:𝑆⟶(0[,]+∞))

Proof of Theorem meaf

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		meaf.m	. . . . 5 ⊢ (𝜑 → 𝑀 ∈ Meas)
2		ismea 44938	. . . . 5 ⊢ (𝑀 ∈ Meas ↔ (((𝑀:dom 𝑀⟶(0[,]+∞) ∧ dom 𝑀 ∈ SAlg) ∧ (𝑀‘∅) = 0) ∧ ∀𝑥 ∈ 𝒫 dom 𝑀((𝑥 ≼ ω ∧ Disj 𝑦 ∈ 𝑥 𝑦) → (𝑀‘∪ 𝑥) = (Σ^‘(𝑀 ↾ 𝑥)))))
3	1, 2	sylib 217	. . . 4 ⊢ (𝜑 → (((𝑀:dom 𝑀⟶(0[,]+∞) ∧ dom 𝑀 ∈ SAlg) ∧ (𝑀‘∅) = 0) ∧ ∀𝑥 ∈ 𝒫 dom 𝑀((𝑥 ≼ ω ∧ Disj 𝑦 ∈ 𝑥 𝑦) → (𝑀‘∪ 𝑥) = (Σ^‘(𝑀 ↾ 𝑥)))))
4	3	simpld 495	. . 3 ⊢ (𝜑 → ((𝑀:dom 𝑀⟶(0[,]+∞) ∧ dom 𝑀 ∈ SAlg) ∧ (𝑀‘∅) = 0))
5	4	simplld 766	. 2 ⊢ (𝜑 → 𝑀:dom 𝑀⟶(0[,]+∞))
6		meaf.s	. . . 4 ⊢ 𝑆 = dom 𝑀
7	6	a1i 11	. . 3 ⊢ (𝜑 → 𝑆 = dom 𝑀)
8	7	feq2d 6690	. 2 ⊢ (𝜑 → (𝑀:𝑆⟶(0[,]+∞) ↔ 𝑀:dom 𝑀⟶(0[,]+∞)))
9	5, 8	mpbird 256	1 ⊢ (𝜑 → 𝑀:𝑆⟶(0[,]+∞))

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1541   ∈ wcel 2106  ∀wral 3060  ∅c0 4318  𝒫 cpw 4596  ∪ cuni 4901  Disj wdisj 5106   class class class wbr 5141  dom cdm 5669   ↾ cres 5671  ⟶wf 6528  ‘cfv 6532  (class class class)co 7393  ωcom 7838   ≼ cdom 8920  0cc0 11092  +∞cpnf 11227  [,]cicc 13309  SAlgcsalg 44795  Σ^{^}csumge0 44849  Meascmea 44936

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2702  ax-rep 5278  ax-sep 5292  ax-nul 5299  ax-pr 5420

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2533  df-eu 2562  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-ne 2940  df-ral 3061  df-rex 3070  df-reu 3376  df-rab 3432  df-v 3475  df-sbc 3774  df-csb 3890  df-dif 3947  df-un 3949  df-in 3951  df-ss 3961  df-nul 4319  df-if 4523  df-pw 4598  df-sn 4623  df-pr 4625  df-op 4629  df-uni 4902  df-iun 4992  df-br 5142  df-opab 5204  df-mpt 5225  df-id 5567  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-rn 5680  df-res 5681  df-ima 5682  df-iota 6484  df-fun 6534  df-fn 6535  df-f 6536  df-f1 6537  df-fo 6538  df-f1o 6539  df-fv 6540  df-mea 44937

This theorem is referenced by:  meacl  44945  meadjun  44949  meadjiunlem  44952  meadjiun  44953