我真係太孤陋寡聞 完全未聽過咩King Queen Property 搵咗先知原來有啲咁嘅名😑 https://math.stackexchange.com/questions/3952365/why-is-it-called-kings-property-of-integration https://math.stackexchange.com/questions/3856735/why-does-the-king-property-of-integration-work