William David Love Appling, 83, of Denton, died Oct. 16 in Denton. He was a math professor from 1963 to 2003. He taught math at Duke University from 1960 to 1963. He served in the U.S. Army. He was popular with students and was known for his intelligence and keen sense of humor. He was a member of the American Mathematical Society. He earned his bachelor’s and doctorate degrees from the University of Texas at Austin.