Definition:Right Normal Element of Relation
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Definition
Let $A$ be a class.
Let $\RR$ be a relation on $A$.
An element $x$ of $A$ is right normal with respect to $\RR$ if and only if:
- $\forall y \in A: \map \RR {y, x}$ holds.
Sources
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $3$: The Natural Numbers: $\S 4$ A double induction principle and its applications: Theorem $4.3$