csi3 - New Foundations Explorer

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Syntax Definition csi3 5758

Description: Extend the definition of a class to include the triple singleton image.

**Hypothesis**
Ref	Expression
cA	class A

**Assertion**
Ref	Expression
csi3	class SI₃ A

See definition df-si3 5759 for more information.

Colors of variables: wff setvar class