This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Logical connectives table condensed.svg The rules seen in File Logical connectives table svg and File Logical connectives table with shorthands svg in condensed form The two squares are Cayley tables of the Klein fourgroup own Matecode Propositional logic Nibble shorthands Group Cayley tables Cczero