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Theorem clss2lem 38337
 Description: The closure of a property is a superset of the closure of a less restrictive property. (Contributed by RP, 24-Jul-2020.)
Hypothesis
Ref Expression
clss2lem.1 (𝜑 → (𝜒𝜓))
Assertion
Ref Expression
clss2lem (𝜑 {𝑥 ∣ (𝑋𝑥𝜓)} ⊆ {𝑥 ∣ (𝑋𝑥𝜒)})
Distinct variable group:   𝜑,𝑥
Allowed substitution hints:   𝜓(𝑥)   𝜒(𝑥)   𝑋(𝑥)

Proof of Theorem clss2lem
StepHypRef Expression
1 clss2lem.1 . . . . 5 (𝜑 → (𝜒𝜓))
21adantld 484 . . . 4 (𝜑 → ((𝑋𝑥𝜒) → 𝜓))
32alrimiv 1968 . . 3 (𝜑 → ∀𝑥((𝑋𝑥𝜒) → 𝜓))
4 pm5.3 750 . . . . 5 (((𝑋𝑥𝜒) → 𝜓) ↔ ((𝑋𝑥𝜒) → (𝑋𝑥𝜓)))
54albii 1860 . . . 4 (∀𝑥((𝑋𝑥𝜒) → 𝜓) ↔ ∀𝑥((𝑋𝑥𝜒) → (𝑋𝑥𝜓)))
6 ss2ab 3776 . . . 4 ({𝑥 ∣ (𝑋𝑥𝜒)} ⊆ {𝑥 ∣ (𝑋𝑥𝜓)} ↔ ∀𝑥((𝑋𝑥𝜒) → (𝑋𝑥𝜓)))
75, 6bitr4i 267 . . 3 (∀𝑥((𝑋𝑥𝜒) → 𝜓) ↔ {𝑥 ∣ (𝑋𝑥𝜒)} ⊆ {𝑥 ∣ (𝑋𝑥𝜓)})
83, 7sylib 208 . 2 (𝜑 → {𝑥 ∣ (𝑋𝑥𝜒)} ⊆ {𝑥 ∣ (𝑋𝑥𝜓)})
9 intss 4606 . 2 ({𝑥 ∣ (𝑋𝑥𝜒)} ⊆ {𝑥 ∣ (𝑋𝑥𝜓)} → {𝑥 ∣ (𝑋𝑥𝜓)} ⊆ {𝑥 ∣ (𝑋𝑥𝜒)})
108, 9syl 17 1 (𝜑 {𝑥 ∣ (𝑋𝑥𝜓)} ⊆ {𝑥 ∣ (𝑋𝑥𝜒)})
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383  ∀wal 1594  {cab 2710   ⊆ wss 3680  ∩ cint 4583 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1835  ax-4 1850  ax-5 1952  ax-6 2018  ax-7 2054  ax-9 2112  ax-10 2132  ax-11 2147  ax-12 2160  ax-13 2355  ax-ext 2704 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-tru 1599  df-ex 1818  df-nf 1823  df-sb 2011  df-clab 2711  df-cleq 2717  df-clel 2720  df-nfc 2855  df-ral 3019  df-in 3687  df-ss 3694  df-int 4584 This theorem is referenced by: (None)
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