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| Mirrors > Home > NFE Home > Th. List > df-pprod | GIF version | ||
| Description: Define the parallel product operation. (Contributed by SF, 9-Feb-2015.) | 
| Ref | Expression | 
|---|---|
| df-pprod | ⊢ PProd (A, B) = ((A ∘ 1st ) ⊗ (B ∘ 2nd )) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | cA | . . 3 class A | |
| 2 | cB | . . 3 class B | |
| 3 | 1, 2 | cpprod 5738 | . 2 class PProd (A, B) | 
| 4 | c1st 4718 | . . . 4 class 1st | |
| 5 | 1, 4 | ccom 4722 | . . 3 class (A ∘ 1st ) | 
| 6 | c2nd 4784 | . . . 4 class 2nd | |
| 7 | 2, 6 | ccom 4722 | . . 3 class (B ∘ 2nd ) | 
| 8 | 5, 7 | ctxp 5736 | . 2 class ((A ∘ 1st ) ⊗ (B ∘ 2nd )) | 
| 9 | 3, 8 | wceq 1642 | 1 wff PProd (A, B) = ((A ∘ 1st ) ⊗ (B ∘ 2nd )) | 
| Colors of variables: wff setvar class | 
| This definition is referenced by: pprodeq1 5835 pprodeq2 5836 qrpprod 5837 pprodexg 5838 brpprod 5840 cnvpprod 5842 | 
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