The 6th Conference on Applied Geometric Algebras in Computer Science and Engineering (AGACSE 2015, http://www-ma2.upc.edu/agacse2015) was held in Barcelona from 29th to 31st July 2015 at the Universitat Politècnica de Catalunya. Hongbo Li, Lei Huang, Lei Dong ,Changpeng Shao were awarded the AGACSE 2015 Best Paper Award,David Hestenes Prize(Rank No.1). The title of their paper is: Elements ...