Reference this Research Paper (copy & paste below code):
Alok Asati, A.D. Singh, Madhuri Asati (2018); Ky Fan’s Best Approximation Theorem in Hilbert space;
Int J Sci Res Publ 4(7) (ISSN: 2250-3153). http://www.ijsrp.org/research-paper-0714.php?rp=P312954