Letfandgbedistributionsandletg_n=(g*δ_n)(x),whereδ_n(x)isacertainsequenceconvergingtotheDiracdeltafunction.Thenon-commutativeneutrixproductfogoffandgisdefinedtobethelimitofthesequence{fg_n},provideditslimithexistsinthesensethat
数学学报:英文版
2006年6期