The method for solving hidden problems.
解伏題之法（伏題を解く方法）
Scientists
Takakazu Seki
Japanese mathematician born c. 1642, called the 'Arithmetical Sage.' He independently discovered determinants before Leibniz and advanced wasan (Japanese mathematics) to internationally significant levels during the Edo period.
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Source: 解伏題之法 (1683)Verified