Renaming Mapping from Set of Mappings on Single Element
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Theorem
Let $X$ and $Y$ be sets.
Let $E$ be the set of all mappings from $X$ to $Y$.
Let $b \in X$.
Let $\RR \subseteq E \times E$ be the relation on $E$ defined as:
- $\RR := \set {\tuple {f, g} \in \RR: \map f b = \map g b}$
Let $e_b: E / \RR \to Y$ be the renaming mapping induced by $\RR$.
Then $e_b$ is a bijection.
Proof
This is an instance of Renaming Mapping is Bijection.
$\blacksquare$
Sources
- 1975: Bert Mendelson: Introduction to Topology (3rd ed.) ... (previous) ... (next): Chapter $1$: Theory of Sets: $\S 7$: Relations: Exercise $5$