金剛經纂要刊定記 2.199

2.199

又有下。即梁武帝解意，明有即無故不有，無即有故不無。相即同時故名不二，不二即如也。此約雙融顯如也。

From 'Moreover, there is' downward: this is the meaning as understood by Emperor Wu of Liang, clarifying that existence is non-existence, hence not existent; non-existence is existence, hence not non-existent. Their mutual identity is simultaneous, hence called non-dual; non-duality is just suchness. This reveals suchness in terms of mutual integration.