https://us.metamath.org/holuni/hbov.html
hbov - Higher-Order Logic Explorer
higher order logichbovexplorer
https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICLP.2010.281
Higher-order Logic Learning and lambda-Progol
higher order logiclearninglambdaprogol
https://researcher.itu.dk/p/en/research-outputs/induction-and-recursion-principles-in-a-higher-order-quantitative
Induction and Recursion Principles in a Higher-Order Quantitative Logic for Probability — IT...
Induction and Recursion Principles in a Higher-Order Quantitative Logic for Probability
in ainductionrecursionprincipleshigher