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Mirrors > Home > MPE Home > Th. List > Mathboxes > abrexss | Structured version Visualization version GIF version |
Description: A necessary condition for an image set to be a subset. (Contributed by Thierry Arnoux, 6-Feb-2017.) |
Ref | Expression |
---|---|
abrexss.1 | ⊢ Ⅎ𝑥𝐶 |
Ref | Expression |
---|---|
abrexss | ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝐶 → {𝑦 ∣ ∃𝑥 ∈ 𝐴 𝑦 = 𝐵} ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfra1 3143 | . . . 4 ⊢ Ⅎ𝑥∀𝑥 ∈ 𝐴 𝐵 ∈ 𝐶 | |
2 | abrexss.1 | . . . . 5 ⊢ Ⅎ𝑥𝐶 | |
3 | 2 | nfcri 2894 | . . . 4 ⊢ Ⅎ𝑥 𝑧 ∈ 𝐶 |
4 | eleq1 2827 | . . . 4 ⊢ (𝑧 = 𝐵 → (𝑧 ∈ 𝐶 ↔ 𝐵 ∈ 𝐶)) | |
5 | vex 3427 | . . . . 5 ⊢ 𝑧 ∈ V | |
6 | 5 | a1i 11 | . . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝐶 → 𝑧 ∈ V) |
7 | rspa 3131 | . . . 4 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ 𝐶 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ 𝐶) | |
8 | 1, 3, 4, 6, 7 | elabreximd 30605 | . . 3 ⊢ ((∀𝑥 ∈ 𝐴 𝐵 ∈ 𝐶 ∧ 𝑧 ∈ {𝑦 ∣ ∃𝑥 ∈ 𝐴 𝑦 = 𝐵}) → 𝑧 ∈ 𝐶) |
9 | 8 | ex 416 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝐶 → (𝑧 ∈ {𝑦 ∣ ∃𝑥 ∈ 𝐴 𝑦 = 𝐵} → 𝑧 ∈ 𝐶)) |
10 | 9 | ssrdv 3923 | 1 ⊢ (∀𝑥 ∈ 𝐴 𝐵 ∈ 𝐶 → {𝑦 ∣ ∃𝑥 ∈ 𝐴 𝑦 = 𝐵} ⊆ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1543 ∈ wcel 2112 {cab 2716 Ⅎwnfc 2887 ∀wral 3064 ∃wrex 3065 Vcvv 3423 ⊆ wss 3883 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-12 2177 ax-ext 2710 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-tru 1546 df-ex 1788 df-nf 1792 df-sb 2073 df-clab 2717 df-cleq 2731 df-clel 2818 df-nfc 2889 df-ral 3069 df-rex 3070 df-v 3425 df-in 3890 df-ss 3900 |
This theorem is referenced by: funimass4f 30722 measvunilem 31923 |
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