Michael Hartley Freedman ( 1951 ni 4 goe?h 21 t? Los Angeles chhut-si) s? Bi-kok e so?-ha?k-ka . I chit-ma t? Microsoft Station Q , chu-iau teh gian-kiu li?ng-chu ke-s?g kap topo-ha?k . In-?i i tui Poincare chhai-chhek e gian-kiu ? to? kong-hian, t? 1986 ni tit-tio?h Fields Chiong .

Pun bun-chiuⁿ s? chi?t phiⁿ phi-a-kiaⁿ . Li thang tau khok-chhiong lai pang-ch?? Wikipedia. hian l?n pian