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Definition df-altop 31028
Description: An alternative definition of ordered pairs. This definition removes a hypothesis from its defining theorem (see altopth 31039), making it more convenient in some circumstances. (Contributed by Scott Fenton, 22-Mar-2012.)
Assertion
Ref Expression
df-altop 𝐴, 𝐵⟫ = {{𝐴}, {𝐴, {𝐵}}}

Detailed syntax breakdown of Definition df-altop
StepHypRef Expression
1 cA . . 3 class 𝐴
2 cB . . 3 class 𝐵
31, 2caltop 31026 . 2 class 𝐴, 𝐵
41csn 4124 . . 3 class {𝐴}
52csn 4124 . . . 4 class {𝐵}
61, 5cpr 4126 . . 3 class {𝐴, {𝐵}}
74, 6cpr 4126 . 2 class {{𝐴}, {𝐴, {𝐵}}}
83, 7wceq 1474 1 wff 𝐴, 𝐵⟫ = {{𝐴}, {𝐴, {𝐵}}}
Colors of variables: wff setvar class
This definition is referenced by:  altopex  31030  altopthsn  31031  altxpsspw  31047  rankaltopb  31049  nfaltop  31050
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