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Definition df-dm 4850
Description: Define the domain of a class. Definition 3 of [Suppes] p. 59. For example, ={<.2,6>.,<.3,9>.}->dom ={2,3} (ex-dm 23646). Another example is the domain of the complex arctangent, (for proof see atandm 22271). Contrast with range (defined in df-rn 4851). For alternate definitions see dfdm2 5369, dfdm3 5027, and dfdm4 5032. The notation "dom " is used by Enderton; other authors sometimes use script D. (Contributed by NM, 1-Aug-1994.)
Assertion
Ref Expression
df-dm
Distinct variable group:   , ,

Detailed syntax breakdown of Definition df-dm
StepHypRef Expression
1 cA . . 3
21cdm 4840 . 2
3 vx . . . . . 6
43cv 1368 . . . . 5
5 vy . . . . . 6
65cv 1368 . . . . 5
74, 6, 1wbr 4292 . . . 4
87, 5wex 1586 . . 3
98, 3cab 2429 . 2
102, 9wceq 1369 1
Colors of variables: wff setvar class
This definition is referenced by:  dfdm3  5027  dfrn2  5028  dfdm4  5032  dfdmf  5033  eldmg  5035  dmun  5046  dm0rn0  5056  nfdm  5081  fliftf  6008  opabdm  25943  domep  27606
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