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Definition df-1st 6538
Description: Define a function that extracts the first member, or abscissa, of an ordered pair. Theorem op1st 6546 proves that it does this. For example, . Equivalent to Definition 5.13 (i) of [Monk1] p. 52 (compare op1sta 5320 and op1stb 4569). The notation is the same as Monk's. (Contributed by NM, 9-Oct-2004.)
Assertion
Ref Expression
df-1st

Detailed syntax breakdown of Definition df-1st
StepHypRef Expression
1 c1st 6536 . 2
2 vx . . 3
3 cvv 3006 . . 3
42cv 1661 . . . . . 6
54csn 3894 . . . . 5
65cdm 4844 . . . 4
76cuni 4101 . . 3
82, 3, 7cmpt 4360 . 2
91, 8wceq 1662 1
Colors of variables: wff set class
This definition is referenced by:  1stval  6540  fo1st  6557  f1stres  6559
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