The Pali Abhidhammatthasangaha reduces them all to four main types. It is neither long nor short, square nor round, regular nor irregular, convex nor concave. Many Abhidharma texts have been lost- likely more than have survived. Abhidharmic thought also extends beyond the sutras to cover new philosophical and psychological ground which is only implicit in sutras or not present at all. Editor s : Bart Dessein and Weijen Teng.
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