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Mirrors > Home > MPE Home > Th. List > Mathboxes > frrlem5b | Structured version Visualization version GIF version |
Description: Lemma for founded recursion. The union of a subclass of 𝐵 is a relationship. (Contributed by Paul Chapman, 29-Apr-2012.) |
Ref | Expression |
---|---|
frrlem5.1 | ⊢ 𝑅 Fr 𝐴 |
frrlem5.2 | ⊢ 𝑅 Se 𝐴 |
frrlem5.3 | ⊢ 𝐵 = {𝑓 ∣ ∃𝑥(𝑓 Fn 𝑥 ∧ (𝑥 ⊆ 𝐴 ∧ ∀𝑦 ∈ 𝑥 Pred(𝑅, 𝐴, 𝑦) ⊆ 𝑥 ∧ ∀𝑦 ∈ 𝑥 (𝑓‘𝑦) = (𝑦𝐺(𝑓 ↾ Pred(𝑅, 𝐴, 𝑦)))))} |
Ref | Expression |
---|---|
frrlem5b | ⊢ (𝐶 ⊆ 𝐵 → Rel ∪ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssel 3597 | . . . 4 ⊢ (𝐶 ⊆ 𝐵 → (𝑧 ∈ 𝐶 → 𝑧 ∈ 𝐵)) | |
2 | frrlem5.3 | . . . . . 6 ⊢ 𝐵 = {𝑓 ∣ ∃𝑥(𝑓 Fn 𝑥 ∧ (𝑥 ⊆ 𝐴 ∧ ∀𝑦 ∈ 𝑥 Pred(𝑅, 𝐴, 𝑦) ⊆ 𝑥 ∧ ∀𝑦 ∈ 𝑥 (𝑓‘𝑦) = (𝑦𝐺(𝑓 ↾ Pred(𝑅, 𝐴, 𝑦)))))} | |
3 | 2 | frrlem2 31781 | . . . . 5 ⊢ (𝑧 ∈ 𝐵 → Fun 𝑧) |
4 | funrel 5905 | . . . . 5 ⊢ (Fun 𝑧 → Rel 𝑧) | |
5 | 3, 4 | syl 17 | . . . 4 ⊢ (𝑧 ∈ 𝐵 → Rel 𝑧) |
6 | 1, 5 | syl6 35 | . . 3 ⊢ (𝐶 ⊆ 𝐵 → (𝑧 ∈ 𝐶 → Rel 𝑧)) |
7 | 6 | ralrimiv 2965 | . 2 ⊢ (𝐶 ⊆ 𝐵 → ∀𝑧 ∈ 𝐶 Rel 𝑧) |
8 | reluni 5241 | . 2 ⊢ (Rel ∪ 𝐶 ↔ ∀𝑧 ∈ 𝐶 Rel 𝑧) | |
9 | 7, 8 | sylibr 224 | 1 ⊢ (𝐶 ⊆ 𝐵 → Rel ∪ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 ∧ w3a 1037 = wceq 1483 ∃wex 1704 ∈ wcel 1990 {cab 2608 ∀wral 2912 ⊆ wss 3574 ∪ cuni 4436 Fr wfr 5070 Se wse 5071 ↾ cres 5116 Rel wrel 5119 Predcpred 5679 Fun wfun 5882 Fn wfn 5883 ‘cfv 5888 (class class class)co 6650 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-iota 5851 df-fun 5890 df-fn 5891 df-fv 5896 df-ov 6653 |
This theorem is referenced by: frrlem5c 31786 |
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