https://zh.wikipedia.org/zh-tw/%E8%88%AC%E8%8B%A5%E7%BB%8F
https://www.britannica.com/topic/Prajnaparamita-Buddhist-literature
為大乘空宗主要依靠的一系列經典，其中部分經典位於大乘佛教最早出現的經書之列
Prajnaparamita, (Sanskrit: “Perfection of Wisdom”) body of sutras and their commentaries that represents the oldest of the major forms of Mahayana Buddhism, one that radically extended the basic concept of ontological voidness (shunyata).
