Because his master, Verrocchio, had not been an expert in wall painting, Leonardo himself lacked significant knowledge of the correct technical process. He tried to invent his own paint mixtures, but he insisted on painting with oils, which do not suit wall painting. As a result, the painting began to deteriorate almost immediately. While Leonardo was working on The Last Supper, the famous mathematician Fra Luca Pacioli came to stay in Milan. As an illegitimate child, Leonardo had been denied secondary education, and thus could not perform even simple algebra. However, he had always had an interest in numbers and math, and he eagerly learned from Pacioli; Pacioli for his part must have shared a mutual awe for his pupil: Leonardo was already the author of so many designs and discoveries. The two even collaborated on a book, De divina proportione,
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