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Topological embedding : ウィキペディア英語版
Embedding

In mathematics, an embedding (or imbedding〔It is suggested by , that the word "embedding" is used instead of "imbedding" by "the English", i.e. the British.〕) is one instance of some mathematical structure contained within another instance, such as a group that is a subgroup.
When some object ''X'' is said to be embedded in another object ''Y'', the embedding is given by some injective and structure-preserving map . The precise meaning of "structure-preserving" depends on the kind of mathematical structure of which ''X'' and ''Y'' are instances. In the terminology of category theory, a structure-preserving map is called a morphism.
The fact that a map is an embedding is often indicated by the use of a "hooked arrow", thus: f : X \hookrightarrow Y. On the other hand, this notation is sometimes reserved for inclusion maps.
Given ''X'' and ''Y'', several different embeddings of ''X'' in ''Y'' may be possible. In many cases of interest there is a standard (or "canonical") embedding, like those of the natural numbers in the integers, the integers in the rational numbers, the rational numbers in the real numbers, and the real numbers in the complex numbers. In such cases it is common to identify the domain ''X'' with its image ''f''(''X'') contained in ''Y'', so that .
==Topology and geometry==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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