M lí-lūn (M-theory) sī bu̍t-lí-ha̍k chin ū tu̍t-phoà-sèng ê 1 ê ki-pún lí-lūn, i thóng-ha̍p 6 chióng lí-lūn, pau-hâm I, IIA, IIB, HE, HO 5 chióng chhiau-hiân lí-lūn (superstring theory) kap 11 chhù-goân ê chhiau-tāng-le̍k lí-lūn. Chit ê lí-lūn iáu leh hoat-tián, mā iáu bô si̍t-giām thang chò kan-chèng.