... nhieu, vi nhu the vua mdt thdi gian vd fch, vua bj lodng ro, bj ldp trong qud trinh phdn tich. Hon nua, trdnh trudng hgp NL duo ro vt>o thua Iqi vwa thiiu. NghTa Id ede don vj ngdn ... twgng ngdn ngw, fim ra dqc frwng cua khdi niem, khdi qudt thdnh khdi niem roi khdng dinh Iqi khdi niem" (1). Trong dgy hge tilng Viet, viec vgn dyng phuong phdp ndy Id td't ylu. ... duge cdc yeu edu sou: 1) NL phdi cd tinh khoa hgc, nghTa Id phdi chua dung cdc dge trung, ede ndi dung edn phdn tfeh mdt edeh rd rdng, khdng ndm trong trudng hgp ngogi le de ngudi hge de...