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| Mirrors > Home > MPE Home > Th. List > iscss2 | Structured version Visualization version GIF version | ||
| Description: It is sufficient to prove that the double orthocomplement is a subset of the target set to show that the set is a closed subspace. (Contributed by Mario Carneiro, 13-Oct-2015.) |
| Ref | Expression |
|---|---|
| cssss.v | ⊢ 𝑉 = (Base‘𝑊) |
| cssss.c | ⊢ 𝐶 = (ClSubSp‘𝑊) |
| ocvcss.o | ⊢ ⊥ = (ocv‘𝑊) |
| Ref | Expression |
|---|---|
| iscss2 | ⊢ ((𝑊 ∈ PreHil ∧ 𝑆 ⊆ 𝑉) → (𝑆 ∈ 𝐶 ↔ ( ⊥ ‘( ⊥ ‘𝑆)) ⊆ 𝑆)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ocvcss.o | . . . 4 ⊢ ⊥ = (ocv‘𝑊) | |
| 2 | cssss.c | . . . 4 ⊢ 𝐶 = (ClSubSp‘𝑊) | |
| 3 | 1, 2 | iscss 21722 | . . 3 ⊢ (𝑊 ∈ PreHil → (𝑆 ∈ 𝐶 ↔ 𝑆 = ( ⊥ ‘( ⊥ ‘𝑆)))) |
| 4 | 3 | adantr 484 | . 2 ⊢ ((𝑊 ∈ PreHil ∧ 𝑆 ⊆ 𝑉) → (𝑆 ∈ 𝐶 ↔ 𝑆 = ( ⊥ ‘( ⊥ ‘𝑆)))) |
| 5 | cssss.v | . . . 4 ⊢ 𝑉 = (Base‘𝑊) | |
| 6 | 5, 1 | ocvocv 21710 | . . 3 ⊢ ((𝑊 ∈ PreHil ∧ 𝑆 ⊆ 𝑉) → 𝑆 ⊆ ( ⊥ ‘( ⊥ ‘𝑆))) |
| 7 | eqss 3949 | . . . 4 ⊢ (𝑆 = ( ⊥ ‘( ⊥ ‘𝑆)) ↔ (𝑆 ⊆ ( ⊥ ‘( ⊥ ‘𝑆)) ∧ ( ⊥ ‘( ⊥ ‘𝑆)) ⊆ 𝑆)) | |
| 8 | 7 | baib 543 | . . 3 ⊢ (𝑆 ⊆ ( ⊥ ‘( ⊥ ‘𝑆)) → (𝑆 = ( ⊥ ‘( ⊥ ‘𝑆)) ↔ ( ⊥ ‘( ⊥ ‘𝑆)) ⊆ 𝑆)) |
| 9 | 6, 8 | syl 17 | . 2 ⊢ ((𝑊 ∈ PreHil ∧ 𝑆 ⊆ 𝑉) → (𝑆 = ( ⊥ ‘( ⊥ ‘𝑆)) ↔ ( ⊥ ‘( ⊥ ‘𝑆)) ⊆ 𝑆)) |
| 10 | 4, 9 | bitrd 281 | 1 ⊢ ((𝑊 ∈ PreHil ∧ 𝑆 ⊆ 𝑉) → (𝑆 ∈ 𝐶 ↔ ( ⊥ ‘( ⊥ ‘𝑆)) ⊆ 𝑆)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 = wceq 1559 ∈ wcel 2141 ⊆ wss 3902 ‘cfv 6515 Basecbs 17235 PreHilcphl 21663 ocvcocv 21699 ClSubSpccss 21700 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7712 ax-cnex 11122 ax-resscn 11123 ax-1cn 11124 ax-icn 11125 ax-addcl 11126 ax-addrcl 11127 ax-mulcl 11128 ax-mulrcl 11129 ax-mulcom 11130 ax-addass 11131 ax-mulass 11132 ax-distr 11133 ax-i2m1 11134 ax-1ne0 11135 ax-1rid 11136 ax-rnegex 11137 ax-rrecex 11138 ax-cnre 11139 ax-pre-lttri 11140 ax-pre-lttrn 11141 ax-pre-ltadd 11142 ax-pre-mulgt0 11143 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-iun 4948 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5538 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5596 df-we 5598 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-pred 6282 df-ord 6343 df-on 6344 df-lim 6345 df-suc 6346 df-iota 6471 df-fun 6517 df-fn 6518 df-f 6519 df-f1 6520 df-fo 6521 df-f1o 6522 df-fv 6523 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-om 7841 df-1st 7964 df-2nd 7965 df-tpos 8199 df-frecs 8255 df-wrecs 8286 df-recs 8335 df-rdg 8374 df-er 8671 df-map 8803 df-en 8921 df-dom 8922 df-sdom 8923 df-pnf 11211 df-mnf 11212 df-xr 11213 df-ltxr 11214 df-le 11215 df-sub 11409 df-neg 11410 df-nn 12204 df-2 12273 df-3 12274 df-4 12275 df-5 12276 df-6 12277 df-7 12278 df-8 12279 df-sets 17190 df-slot 17208 df-ndx 17220 df-base 17236 df-plusg 17289 df-mulr 17290 df-sca 17292 df-vsca 17293 df-ip 17294 df-0g 17460 df-mgm 18664 df-sgrp 18743 df-mnd 18759 df-mhm 18807 df-grp 18968 df-ghm 19244 df-mgp 20177 df-ur 20218 df-ring 20271 df-oppr 20372 df-rhm 20507 df-staf 20875 df-srng 20876 df-lmod 20916 df-lmhm 21076 df-lvec 21157 df-sra 21227 df-rgmod 21228 df-phl 21665 df-ocv 21702 df-css 21703 |
| This theorem is referenced by: ocvcss 21726 lsmcss 21731 cssmre 21732 |
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