Isabelle
https://isabelle.in.tum.de/
Isabelle Light
2009-2018
HOL Light is a modern theorem proving system characterised by its powerful, low level interface that allows for flexibility and programmability. However, considerable effort is required to become accustomed to the system and to reach a point where one can comfortably achieve simple natural deduction proofs. Isabelle is another powerful and widely used theorem prover that provides useful features …