Primal ideal
Introduction In mathematics, an element ''a'' of a commutative ring ''R'' is called '''(relatively) prime''' to an ideal ''I'' if whenever ''ab'' is an element of ''I'' then ''b'' is also an element of ''I''.A proper ideal ''I'' of a commutative ring ''A'' is said to be '''primal''' if the elements that are not prime to it form an ideal.
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