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I have added a sentence about this book in the "In Literature" section, but I have not mentioned that it is available from Open Library at  https://openlibrary.org/works/OL143041W/Tertium_quid I am not sure if copyright allows it to be mentioned (or, to be honest, how to make a proper link). 61.68.250.211 ( talk) 12:35, 16 March 2022 (UTC) reply

Tertium quid (philosophy, 'third thing') is critique of dualism and polyism (including some ancient/Classical Greek, (Kabbalah) far Eastern, German Idealism) three to four or more planes (esotericism) that two different substances need a 'third thing' for interaction, which is argued replaces those as new monism (perhaps dual-aspect but one aspect is entirely within the other and may be illusory)-- dchmelik ( t| c) 01:53, 13 August 2022 (UTC) reply