a brief overview of the notation: https://en.wikipedia.org/wiki/Glossary_of_Principia_Mathematica#Symbols_introduced_in_Principia_Mathematica_volume_I https://

a brief overview of the notation: https://en.wikipedia.org/wiki/Glossary_of_Principia_Mathematica#Symbols_introduced_in_Principia_Mathematica_volume_I https://en.wikipedia.org/wiki/Glossary_of_Principia_Mathemat...