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Theorem reghmph 21879
Description: Regularity is a topological property. (Contributed by Mario Carneiro, 25-Aug-2015.)
Assertion
Ref Expression
reghmph (𝐽𝐾 → (𝐽 ∈ Reg → 𝐾 ∈ Reg))

Proof of Theorem reghmph
Dummy variables 𝑤 𝑓 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 hmph 21862 . 2 (𝐽𝐾 ↔ (𝐽Homeo𝐾) ≠ ∅)
2 n0 4097 . . 3 ((𝐽Homeo𝐾) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝐽Homeo𝐾))
3 hmeocn 21846 . . . . . . . 8 (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓 ∈ (𝐽 Cn 𝐾))
43adantl 473 . . . . . . 7 ((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) → 𝑓 ∈ (𝐽 Cn 𝐾))
5 cntop2 21328 . . . . . . 7 (𝑓 ∈ (𝐽 Cn 𝐾) → 𝐾 ∈ Top)
64, 5syl 17 . . . . . 6 ((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) → 𝐾 ∈ Top)
7 simpll 783 . . . . . . . . 9 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝐽 ∈ Reg)
84adantr 472 . . . . . . . . . 10 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝑓 ∈ (𝐽 Cn 𝐾))
9 simprl 787 . . . . . . . . . 10 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝑥𝐾)
10 cnima 21352 . . . . . . . . . 10 ((𝑓 ∈ (𝐽 Cn 𝐾) ∧ 𝑥𝐾) → (𝑓𝑥) ∈ 𝐽)
118, 9, 10syl2anc 579 . . . . . . . . 9 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → (𝑓𝑥) ∈ 𝐽)
12 eqid 2765 . . . . . . . . . . . . 13 𝐽 = 𝐽
13 eqid 2765 . . . . . . . . . . . . 13 𝐾 = 𝐾
1412, 13hmeof1o 21850 . . . . . . . . . . . 12 (𝑓 ∈ (𝐽Homeo𝐾) → 𝑓: 𝐽1-1-onto 𝐾)
1514ad2antlr 718 . . . . . . . . . . 11 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝑓: 𝐽1-1-onto 𝐾)
16 f1ocnv 6334 . . . . . . . . . . 11 (𝑓: 𝐽1-1-onto 𝐾𝑓: 𝐾1-1-onto 𝐽)
17 f1ofn 6323 . . . . . . . . . . 11 (𝑓: 𝐾1-1-onto 𝐽𝑓 Fn 𝐾)
1815, 16, 173syl 18 . . . . . . . . . 10 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝑓 Fn 𝐾)
19 elssuni 4627 . . . . . . . . . . 11 (𝑥𝐾𝑥 𝐾)
2019ad2antrl 719 . . . . . . . . . 10 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝑥 𝐾)
21 simprr 789 . . . . . . . . . 10 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝑦𝑥)
22 fnfvima 6691 . . . . . . . . . 10 ((𝑓 Fn 𝐾𝑥 𝐾𝑦𝑥) → (𝑓𝑦) ∈ (𝑓𝑥))
2318, 20, 21, 22syl3anc 1490 . . . . . . . . 9 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → (𝑓𝑦) ∈ (𝑓𝑥))
24 regsep 21421 . . . . . . . . 9 ((𝐽 ∈ Reg ∧ (𝑓𝑥) ∈ 𝐽 ∧ (𝑓𝑦) ∈ (𝑓𝑥)) → ∃𝑤𝐽 ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))
257, 11, 23, 24syl3anc 1490 . . . . . . . 8 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → ∃𝑤𝐽 ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))
26 simpllr 793 . . . . . . . . . 10 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑓 ∈ (𝐽Homeo𝐾))
27 simprl 787 . . . . . . . . . 10 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑤𝐽)
28 hmeoima 21851 . . . . . . . . . 10 ((𝑓 ∈ (𝐽Homeo𝐾) ∧ 𝑤𝐽) → (𝑓𝑤) ∈ 𝐾)
2926, 27, 28syl2anc 579 . . . . . . . . 9 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → (𝑓𝑤) ∈ 𝐾)
3020, 21sseldd 3764 . . . . . . . . . . . 12 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → 𝑦 𝐾)
3130adantr 472 . . . . . . . . . . 11 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑦 𝐾)
32 simprrl 799 . . . . . . . . . . 11 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → (𝑓𝑦) ∈ 𝑤)
3318adantr 472 . . . . . . . . . . . 12 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑓 Fn 𝐾)
34 elpreima 6529 . . . . . . . . . . . 12 (𝑓 Fn 𝐾 → (𝑦 ∈ (𝑓𝑤) ↔ (𝑦 𝐾 ∧ (𝑓𝑦) ∈ 𝑤)))
3533, 34syl 17 . . . . . . . . . . 11 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → (𝑦 ∈ (𝑓𝑤) ↔ (𝑦 𝐾 ∧ (𝑓𝑦) ∈ 𝑤)))
3631, 32, 35mpbir2and 704 . . . . . . . . . 10 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑦 ∈ (𝑓𝑤))
37 imacnvcnv 5784 . . . . . . . . . 10 (𝑓𝑤) = (𝑓𝑤)
3836, 37syl6eleq 2854 . . . . . . . . 9 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑦 ∈ (𝑓𝑤))
39 elssuni 4627 . . . . . . . . . . . 12 (𝑤𝐽𝑤 𝐽)
4039ad2antrl 719 . . . . . . . . . . 11 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑤 𝐽)
4112hmeocls 21854 . . . . . . . . . . 11 ((𝑓 ∈ (𝐽Homeo𝐾) ∧ 𝑤 𝐽) → ((cls‘𝐾)‘(𝑓𝑤)) = (𝑓 “ ((cls‘𝐽)‘𝑤)))
4226, 40, 41syl2anc 579 . . . . . . . . . 10 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → ((cls‘𝐾)‘(𝑓𝑤)) = (𝑓 “ ((cls‘𝐽)‘𝑤)))
43 simprrr 800 . . . . . . . . . . 11 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥))
4415adantr 472 . . . . . . . . . . . . 13 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝑓: 𝐽1-1-onto 𝐾)
45 f1ofun 6324 . . . . . . . . . . . . 13 (𝑓: 𝐽1-1-onto 𝐾 → Fun 𝑓)
4644, 45syl 17 . . . . . . . . . . . 12 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → Fun 𝑓)
477adantr 472 . . . . . . . . . . . . . . 15 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝐽 ∈ Reg)
48 regtop 21420 . . . . . . . . . . . . . . 15 (𝐽 ∈ Reg → 𝐽 ∈ Top)
4947, 48syl 17 . . . . . . . . . . . . . 14 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → 𝐽 ∈ Top)
5012clsss3 21146 . . . . . . . . . . . . . 14 ((𝐽 ∈ Top ∧ 𝑤 𝐽) → ((cls‘𝐽)‘𝑤) ⊆ 𝐽)
5149, 40, 50syl2anc 579 . . . . . . . . . . . . 13 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → ((cls‘𝐽)‘𝑤) ⊆ 𝐽)
52 f1odm 6326 . . . . . . . . . . . . . 14 (𝑓: 𝐽1-1-onto 𝐾 → dom 𝑓 = 𝐽)
5344, 52syl 17 . . . . . . . . . . . . 13 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → dom 𝑓 = 𝐽)
5451, 53sseqtr4d 3804 . . . . . . . . . . . 12 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → ((cls‘𝐽)‘𝑤) ⊆ dom 𝑓)
55 funimass3 6525 . . . . . . . . . . . 12 ((Fun 𝑓 ∧ ((cls‘𝐽)‘𝑤) ⊆ dom 𝑓) → ((𝑓 “ ((cls‘𝐽)‘𝑤)) ⊆ 𝑥 ↔ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))
5646, 54, 55syl2anc 579 . . . . . . . . . . 11 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → ((𝑓 “ ((cls‘𝐽)‘𝑤)) ⊆ 𝑥 ↔ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))
5743, 56mpbird 248 . . . . . . . . . 10 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → (𝑓 “ ((cls‘𝐽)‘𝑤)) ⊆ 𝑥)
5842, 57eqsstrd 3801 . . . . . . . . 9 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → ((cls‘𝐾)‘(𝑓𝑤)) ⊆ 𝑥)
59 eleq2 2833 . . . . . . . . . . 11 (𝑧 = (𝑓𝑤) → (𝑦𝑧𝑦 ∈ (𝑓𝑤)))
60 fveq2 6377 . . . . . . . . . . . 12 (𝑧 = (𝑓𝑤) → ((cls‘𝐾)‘𝑧) = ((cls‘𝐾)‘(𝑓𝑤)))
6160sseq1d 3794 . . . . . . . . . . 11 (𝑧 = (𝑓𝑤) → (((cls‘𝐾)‘𝑧) ⊆ 𝑥 ↔ ((cls‘𝐾)‘(𝑓𝑤)) ⊆ 𝑥))
6259, 61anbi12d 624 . . . . . . . . . 10 (𝑧 = (𝑓𝑤) → ((𝑦𝑧 ∧ ((cls‘𝐾)‘𝑧) ⊆ 𝑥) ↔ (𝑦 ∈ (𝑓𝑤) ∧ ((cls‘𝐾)‘(𝑓𝑤)) ⊆ 𝑥)))
6362rspcev 3462 . . . . . . . . 9 (((𝑓𝑤) ∈ 𝐾 ∧ (𝑦 ∈ (𝑓𝑤) ∧ ((cls‘𝐾)‘(𝑓𝑤)) ⊆ 𝑥)) → ∃𝑧𝐾 (𝑦𝑧 ∧ ((cls‘𝐾)‘𝑧) ⊆ 𝑥))
6429, 38, 58, 63syl12anc 865 . . . . . . . 8 ((((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) ∧ (𝑤𝐽 ∧ ((𝑓𝑦) ∈ 𝑤 ∧ ((cls‘𝐽)‘𝑤) ⊆ (𝑓𝑥)))) → ∃𝑧𝐾 (𝑦𝑧 ∧ ((cls‘𝐾)‘𝑧) ⊆ 𝑥))
6525, 64rexlimddv 3182 . . . . . . 7 (((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) ∧ (𝑥𝐾𝑦𝑥)) → ∃𝑧𝐾 (𝑦𝑧 ∧ ((cls‘𝐾)‘𝑧) ⊆ 𝑥))
6665ralrimivva 3118 . . . . . 6 ((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) → ∀𝑥𝐾𝑦𝑥𝑧𝐾 (𝑦𝑧 ∧ ((cls‘𝐾)‘𝑧) ⊆ 𝑥))
67 isreg 21419 . . . . . 6 (𝐾 ∈ Reg ↔ (𝐾 ∈ Top ∧ ∀𝑥𝐾𝑦𝑥𝑧𝐾 (𝑦𝑧 ∧ ((cls‘𝐾)‘𝑧) ⊆ 𝑥)))
686, 66, 67sylanbrc 578 . . . . 5 ((𝐽 ∈ Reg ∧ 𝑓 ∈ (𝐽Homeo𝐾)) → 𝐾 ∈ Reg)
6968expcom 402 . . . 4 (𝑓 ∈ (𝐽Homeo𝐾) → (𝐽 ∈ Reg → 𝐾 ∈ Reg))
7069exlimiv 2025 . . 3 (∃𝑓 𝑓 ∈ (𝐽Homeo𝐾) → (𝐽 ∈ Reg → 𝐾 ∈ Reg))
712, 70sylbi 208 . 2 ((𝐽Homeo𝐾) ≠ ∅ → (𝐽 ∈ Reg → 𝐾 ∈ Reg))
721, 71sylbi 208 1 (𝐽𝐾 → (𝐽 ∈ Reg → 𝐾 ∈ Reg))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 197  wa 384   = wceq 1652  wex 1874  wcel 2155  wne 2937  wral 3055  wrex 3056  wss 3734  c0 4081   cuni 4596   class class class wbr 4811  ccnv 5278  dom cdm 5279  cima 5282  Fun wfun 6064   Fn wfn 6065  1-1-ontowf1o 6069  cfv 6070  (class class class)co 6844  Topctop 20980  clsccl 21105   Cn ccn 21311  Regcreg 21396  Homeochmeo 21839  chmph 21840
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-8 2157  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-rep 4932  ax-sep 4943  ax-nul 4951  ax-pow 5003  ax-pr 5064  ax-un 7149
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ne 2938  df-ral 3060  df-rex 3061  df-reu 3062  df-rab 3064  df-v 3352  df-sbc 3599  df-csb 3694  df-dif 3737  df-un 3739  df-in 3741  df-ss 3748  df-nul 4082  df-if 4246  df-pw 4319  df-sn 4337  df-pr 4339  df-op 4343  df-uni 4597  df-int 4636  df-iun 4680  df-iin 4681  df-br 4812  df-opab 4874  df-mpt 4891  df-id 5187  df-xp 5285  df-rel 5286  df-cnv 5287  df-co 5288  df-dm 5289  df-rn 5290  df-res 5291  df-ima 5292  df-suc 5916  df-iota 6033  df-fun 6072  df-fn 6073  df-f 6074  df-f1 6075  df-fo 6076  df-f1o 6077  df-fv 6078  df-ov 6847  df-oprab 6848  df-mpt2 6849  df-1st 7368  df-2nd 7369  df-1o 7766  df-map 8064  df-top 20981  df-topon 20998  df-cld 21106  df-cls 21108  df-cn 21314  df-reg 21403  df-hmeo 21841  df-hmph 21842
This theorem is referenced by: (None)
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