Su Junyu taught Wang Qi two more calculation methods, known in Shenzhou as the "Baize Expansion Method" and the "Liye Expansion Method."
Looking at the formulas Su Junyu had written down, Wang Qi felt a sudden pang of sentiment. They were precisely the Laplace expansion and Fourier expansion he knew from his previous life, both peerless methods for turning complexity into simplicity.
Did this count as "even death couldn't make me forget doing problems"?
Wang Qi mocked himself inwardly.
After teaching the Baize Expansion Method and Liye Expansion Method, Su Junyu gave Wang Qi a Tianmu Core and returned the spiritual energy eigen Change-Sky Formula for mixed red copper they had calculated earlier. He told Wang Qi to simplify the formula for mixed red copper, then derive the spiritual energy eigen Change-Sky Formula for the Tianmu Core.
Su Junyu specifically emphasized that the Liye Expansion Method was the most important of all. It would be of great use when calculating the eigenformulas of mana in the future.
The Liye Expansion Method, which was the Fourier series expansion Wang Qi knew, was used to simplify periodic functions. Any cultivation method either required circulating energy through the heavenly cycle or regulated breathing and absorption, so the mana it cultivated was bound to be periodic. Once one was familiar with the Liye Expansion Method, one could swiftly see through the mysteries of an opponent's method during a magical battle and seize the rhythm of combat.
Before long, Wang Qi handed the two formulas to Su Junyu.
Su Junyu took one look and stared in astonishment. "Say, kid, have you studied this before?"
Wang Qi shook his head in denial. The surprise in Su Junyu's eyes deepened. He praised him, "You truly are one of the most gifted people I've ever encountered."
Wang Qi