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math.CT2020
Lattice Theoretic Properties of Aprroximating Ideals
Xianhui Fu, Ivo Herzog, Jiangsheng Hu +1
It is proved that a finite intersection of special preenveloping ideals in an exact category is a special preenveloping ideal. Dually, a finite inter…
math.CT2013★ 24 cited
Powers of the Phantom Ideal
Xianhui Fu, Ivo Herzog
It is proved that if G is a finite group, then the order of G is a proper upper bound for the phantom number of G. More specifically, if k is a field whose characteristic divides t…