irreducible component (Q6073574)
concept, used to make formal the idea that a set such as defined by the equation XY=0 is the union of the two lines X=0 and Y=0
Language  Label  Description  Also known as 

English 
irreducible component

concept, used to make formal the idea that a set such as defined by the equation XY=0 is the union of the two lines X=0 and Y=0

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Wikipedia(2 entries)
 enwiki Irreducible component
 jawiki 既約成分