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Theorem trrelind 43568
Description: The intersection of transitive relations is a transitive relation. (Contributed by RP, 24-Dec-2019.)
Hypotheses
Ref Expression
trrelind.r (𝜑 → (𝑅𝑅) ⊆ 𝑅)
trrelind.s (𝜑 → (𝑆𝑆) ⊆ 𝑆)
trrelind.t (𝜑𝑇 = (𝑅𝑆))
Assertion
Ref Expression
trrelind (𝜑 → (𝑇𝑇) ⊆ 𝑇)

Proof of Theorem trrelind
StepHypRef Expression
1 trrelind.r . . . 4 (𝜑 → (𝑅𝑅) ⊆ 𝑅)
2 inss1 4252 . . . . 5 (𝑅𝑆) ⊆ 𝑅
32a1i 11 . . . 4 (𝜑 → (𝑅𝑆) ⊆ 𝑅)
41, 3, 3trrelssd 15018 . . 3 (𝜑 → ((𝑅𝑆) ∘ (𝑅𝑆)) ⊆ 𝑅)
5 trrelind.s . . . 4 (𝜑 → (𝑆𝑆) ⊆ 𝑆)
6 inss2 4253 . . . . 5 (𝑅𝑆) ⊆ 𝑆
76a1i 11 . . . 4 (𝜑 → (𝑅𝑆) ⊆ 𝑆)
85, 7, 7trrelssd 15018 . . 3 (𝜑 → ((𝑅𝑆) ∘ (𝑅𝑆)) ⊆ 𝑆)
94, 8ssind 4256 . 2 (𝜑 → ((𝑅𝑆) ∘ (𝑅𝑆)) ⊆ (𝑅𝑆))
10 trrelind.t . . 3 (𝜑𝑇 = (𝑅𝑆))
1110, 10coeq12d 5888 . 2 (𝜑 → (𝑇𝑇) = ((𝑅𝑆) ∘ (𝑅𝑆)))
129, 11, 103sstr4d 4050 1 (𝜑 → (𝑇𝑇) ⊆ 𝑇)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1537  cin 3969  wss 3970  ccom 5703
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2105  ax-9 2113  ax-ext 2705
This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1540  df-ex 1778  df-sb 2065  df-clab 2712  df-cleq 2726  df-clel 2813  df-rab 3439  df-v 3484  df-in 3977  df-ss 3987  df-br 5170  df-opab 5232  df-co 5708
This theorem is referenced by:  xpintrreld  43569
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