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Identity map

From Encyclopedia of Mathematics
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on a set $X$

The transformation on $X$, often denoted $1_X$ or $\text{id}_X$ defined by $x \mapsto x$ for all $x \in X$.

How to Cite This Entry:
Identity map. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Identity_map&oldid=39297