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Mirrors > Home > MPE Home > Th. List > Mathboxes > df-bj-diag | Structured version Visualization version GIF version |
Description: Define the diagonal of the Cartesian square of a set. (Contributed by BJ, 22-Jun-2019.) |
Ref | Expression |
---|---|
df-bj-diag | ⊢ Diag = (𝑥 ∈ V ↦ ( I ∩ (𝑥 × 𝑥))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cdiag2 33088 | . 2 class Diag | |
2 | vx | . . 3 setvar 𝑥 | |
3 | cvv 3200 | . . 3 class V | |
4 | cid 5023 | . . . 4 class I | |
5 | 2 | cv 1482 | . . . . 5 class 𝑥 |
6 | 5, 5 | cxp 5112 | . . . 4 class (𝑥 × 𝑥) |
7 | 4, 6 | cin 3573 | . . 3 class ( I ∩ (𝑥 × 𝑥)) |
8 | 2, 3, 7 | cmpt 4729 | . 2 class (𝑥 ∈ V ↦ ( I ∩ (𝑥 × 𝑥))) |
9 | 1, 8 | wceq 1483 | 1 wff Diag = (𝑥 ∈ V ↦ ( I ∩ (𝑥 × 𝑥))) |
Colors of variables: wff setvar class |
This definition is referenced by: bj-diagval 33090 |
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