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Mirrors > Home > NFE Home > Th. List > imasn | GIF version |
Description: The image of a singleton. (Contributed by set.mm contributors, 9-Jan-2015.) |
Ref | Expression |
---|---|
imasn | ⊢ (R “ {A}) = {y ∣ ARy} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ima 4727 | . . 3 ⊢ (R “ {A}) = {y ∣ ∃x ∈ {A}xRy} | |
2 | breq1 4642 | . . . . 5 ⊢ (x = A → (xRy ↔ ARy)) | |
3 | 2 | rexsng 3766 | . . . 4 ⊢ (A ∈ V → (∃x ∈ {A}xRy ↔ ARy)) |
4 | 3 | abbidv 2467 | . . 3 ⊢ (A ∈ V → {y ∣ ∃x ∈ {A}xRy} = {y ∣ ARy}) |
5 | 1, 4 | syl5eq 2397 | . 2 ⊢ (A ∈ V → (R “ {A}) = {y ∣ ARy}) |
6 | ima0 5013 | . . 3 ⊢ (R “ ∅) = ∅ | |
7 | snprc 3788 | . . . . 5 ⊢ (¬ A ∈ V ↔ {A} = ∅) | |
8 | 7 | biimpi 186 | . . . 4 ⊢ (¬ A ∈ V → {A} = ∅) |
9 | 8 | imaeq2d 4942 | . . 3 ⊢ (¬ A ∈ V → (R “ {A}) = (R “ ∅)) |
10 | brex 4689 | . . . . . . 7 ⊢ (ARy → (A ∈ V ∧ y ∈ V)) | |
11 | 10 | simpld 445 | . . . . . 6 ⊢ (ARy → A ∈ V) |
12 | 11 | exlimiv 1634 | . . . . 5 ⊢ (∃y ARy → A ∈ V) |
13 | 12 | con3i 127 | . . . 4 ⊢ (¬ A ∈ V → ¬ ∃y ARy) |
14 | abn0 3568 | . . . . . 6 ⊢ ({y ∣ ARy} ≠ ∅ ↔ ∃y ARy) | |
15 | df-ne 2518 | . . . . . 6 ⊢ ({y ∣ ARy} ≠ ∅ ↔ ¬ {y ∣ ARy} = ∅) | |
16 | 14, 15 | bitr3i 242 | . . . . 5 ⊢ (∃y ARy ↔ ¬ {y ∣ ARy} = ∅) |
17 | 16 | con2bii 322 | . . . 4 ⊢ ({y ∣ ARy} = ∅ ↔ ¬ ∃y ARy) |
18 | 13, 17 | sylibr 203 | . . 3 ⊢ (¬ A ∈ V → {y ∣ ARy} = ∅) |
19 | 6, 9, 18 | 3eqtr4a 2411 | . 2 ⊢ (¬ A ∈ V → (R “ {A}) = {y ∣ ARy}) |
20 | 5, 19 | pm2.61i 156 | 1 ⊢ (R “ {A}) = {y ∣ ARy} |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∃wex 1541 = wceq 1642 ∈ wcel 1710 {cab 2339 ≠ wne 2516 ∃wrex 2615 Vcvv 2859 ∅c0 3550 {csn 3737 class class class wbr 4639 “ cima 4722 |
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-ima 4727 df-xp 4784 df-cnv 4785 df-rn 4786 df-dm 4787 df-res 4788 |
This theorem is referenced by: elimasn 5019 epini 5021 iniseg 5022 fnsnfv 5373 funfv2 5376 fvco2 5382 dfec2 5948 mapsn 6026 nmembers1lem1 6268 nchoicelem4 6292 |
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