A subset I ⊆ R closed under + and absorbing · (rI ⊆ I for all r). Quotient R/I is a ring. Maximal ideals correspond to points of the prime spectrum Spec R.
A subset I ⊆ R closed under + and absorbing · (rI ⊆ I for all r). Quotient R/I is a ring. Maximal ideals correspond to points of the prime spectrum Spec R.