Chalk and human kindness Students never had to memorize formulae in Wang You-ling's mathematics class. He would provide logical proofs and then give an oral explanation. Therefore, formula after unwieldy formula became easily accessible.
上王又陵的數學課，從來不必背公式，他會先證明再用口頭解釋，因此一條條「頑固」的定義定理就變成易懂的口語。