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Mirrors > Home > MPE Home > Th. List > Mathboxes > altxpeq2 | Structured version Visualization version GIF version |
Description: Equality for alternate Cartesian products. (Contributed by Scott Fenton, 24-Mar-2012.) |
Ref | Expression |
---|---|
altxpeq2 | ⊢ (𝐴 = 𝐵 → (𝐶 ×× 𝐴) = (𝐶 ×× 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rexeq 3319 | . . . 4 ⊢ (𝐴 = 𝐵 → (∃𝑦 ∈ 𝐴 𝑧 = ⟪𝑥, 𝑦⟫ ↔ ∃𝑦 ∈ 𝐵 𝑧 = ⟪𝑥, 𝑦⟫)) | |
2 | 1 | rexbidv 3176 | . . 3 ⊢ (𝐴 = 𝐵 → (∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐴 𝑧 = ⟪𝑥, 𝑦⟫ ↔ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐵 𝑧 = ⟪𝑥, 𝑦⟫)) |
3 | 2 | abbidv 2799 | . 2 ⊢ (𝐴 = 𝐵 → {𝑧 ∣ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐴 𝑧 = ⟪𝑥, 𝑦⟫} = {𝑧 ∣ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐵 𝑧 = ⟪𝑥, 𝑦⟫}) |
4 | df-altxp 35235 | . 2 ⊢ (𝐶 ×× 𝐴) = {𝑧 ∣ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐴 𝑧 = ⟪𝑥, 𝑦⟫} | |
5 | df-altxp 35235 | . 2 ⊢ (𝐶 ×× 𝐵) = {𝑧 ∣ ∃𝑥 ∈ 𝐶 ∃𝑦 ∈ 𝐵 𝑧 = ⟪𝑥, 𝑦⟫} | |
6 | 3, 4, 5 | 3eqtr4g 2795 | 1 ⊢ (𝐴 = 𝐵 → (𝐶 ×× 𝐴) = (𝐶 ×× 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1539 {cab 2707 ∃wrex 3068 ⟪caltop 35232 ×× caltxp 35233 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-9 2114 ax-ext 2701 |
This theorem depends on definitions: df-bi 206 df-an 395 df-ex 1780 df-sb 2066 df-clab 2708 df-cleq 2722 df-rex 3069 df-altxp 35235 |
This theorem is referenced by: (None) |
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