Actually, the notation used above is for strongly-typed higher-order theories. See the following: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3418003

Actually, the notation used above is for strongly-typed higher-order theories. See the following: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3418003 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3418003 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3459566 https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3459566