Theorem iserd 5942

Description: A symmetric, transitive relationship is an equivalence relationship. (Contributed by SF, 22-Feb-2015.)

Hypotheses

Ref	Expression
iserd.1	⊢ (φ → R ∈ V)
iserd.2	⊢ (φ → A ∈ W)
iserd.3	⊢ ((φ ∧ (x ∈ A ∧ y ∈ A) ∧ xRy) → yRx)
iserd.4	⊢ ((φ ∧ (x ∈ A ∧ y ∈ A ∧ z ∈ A) ∧ (xRy ∧ yRz)) → xRz)

Assertion

Ref	Expression
iserd	⊢ (φ → R Er A)

Distinct variable groups:   x,A,y,z   φ,x,y,z   x,R,y,z

Allowed substitution hints:   V(x,y,z)   W(x,y,z)

Proof of Theorem iserd

Dummy variables a r are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		iserd.3	. . . . 5 ⊢ ((φ ∧ (x ∈ A ∧ y ∈ A) ∧ xRy) → yRx)
2	1	3expia 1153	. . . 4 ⊢ ((φ ∧ (x ∈ A ∧ y ∈ A)) → (xRy → yRx))
3	2	ralrimivva 2706	. . 3 ⊢ (φ → ∀x ∈ A ∀y ∈ A (xRy → yRx))
4		iserd.1	. . . 4 ⊢ (φ → R ∈ V)
5		iserd.2	. . . 4 ⊢ (φ → A ∈ W)
6		breq 4641	. . . . . . 7 ⊢ (r = R → (xry ↔ xRy))
7		breq 4641	. . . . . . 7 ⊢ (r = R → (yrx ↔ yRx))
8	6, 7	imbi12d 311	. . . . . 6 ⊢ (r = R → ((xry → yrx) ↔ (xRy → yRx)))
9	8	2ralbidv 2656	. . . . 5 ⊢ (r = R → (∀x ∈ a ∀y ∈ a (xry → yrx) ↔ ∀x ∈ a ∀y ∈ a (xRy → yRx)))
10		raleq 2807	. . . . . 6 ⊢ (a = A → (∀y ∈ a (xRy → yRx) ↔ ∀y ∈ A (xRy → yRx)))
11	10	raleqbi1dv 2815	. . . . 5 ⊢ (a = A → (∀x ∈ a ∀y ∈ a (xRy → yRx) ↔ ∀x ∈ A ∀y ∈ A (xRy → yRx)))
12		df-sym 5908	. . . . 5 ⊢ Sym = {⟨r, a⟩ ∣ ∀x ∈ a ∀y ∈ a (xry → yrx)}
13	9, 11, 12	brabg 4706	. . . 4 ⊢ ((R ∈ V ∧ A ∈ W) → (R Sym A ↔ ∀x ∈ A ∀y ∈ A (xRy → yRx)))
14	4, 5, 13	syl2anc 642	. . 3 ⊢ (φ → (R Sym A ↔ ∀x ∈ A ∀y ∈ A (xRy → yRx)))
15	3, 14	mpbird 223	. 2 ⊢ (φ → R Sym A)
16		iserd.4	. . 3 ⊢ ((φ ∧ (x ∈ A ∧ y ∈ A ∧ z ∈ A) ∧ (xRy ∧ yRz)) → xRz)
17	4, 5, 16	trrd 5925	. 2 ⊢ (φ → R Trans A)
18		ersymtr 5932	. 2 ⊢ (R Er A ↔ (R Sym A ∧ R Trans A))
19	15, 17, 18	sylanbrc 645	1 ⊢ (φ → R Er A)

Syntax hints:   → wi 4   ↔ wb 176   ∧ wa 358   ∧ w3a 934   = wceq 1642   ∈ wcel 1710  ∀wral 2614   class class class wbr 4639   Trans ctrans 5888   Sym csym 5897   Er cer 5898

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-xp 4079  ax-cnv 4080  ax-1c 4081  ax-sset 4082  ax-si 4083  ax-ins2 4084  ax-ins3 4085  ax-typlower 4086  ax-sn 4087

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-ral 2619  df-rex 2620  df-reu 2621  df-rmo 2622  df-rab 2623  df-v 2861  df-sbc 3047  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-symdif 3216  df-ss 3259  df-pss 3261  df-nul 3551  df-if 3663  df-pw 3724  df-sn 3741  df-pr 3742  df-uni 3892  df-int 3927  df-opk 4058  df-1c 4136  df-pw1 4137  df-uni1 4138  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192  df-ssetk 4193  df-imagek 4194  df-idk 4195  df-iota 4339  df-0c 4377  df-addc 4378  df-nnc 4379  df-fin 4380  df-lefin 4440  df-ltfin 4441  df-ncfin 4442  df-tfin 4443  df-evenfin 4444  df-oddfin 4445  df-sfin 4446  df-spfin 4447  df-phi 4565  df-op 4566  df-proj1 4567  df-proj2 4568  df-opab 4623  df-br 4640  df-trans 5899  df-sym 5908  df-er 5909

This theorem is referenced by:  ider  5943  eqer  5961  ener  6039