Reading Feferman & Feferman 'Alfred Tarski: life and logic', I've come across this passage (p.79) that I hope a logician would explain a bit further:

"Russell had found a fundamental inconsistency in Frege's system; to avoid contradictions and repair the program, in Principia Mathematica he introduced complicated restrictions on the form of its basic principles."
[it's this next sentence that provokes my Q:]
"But mathematics could no longer be reduced to logic when restricted in that way and so, to make up for the loss, Russell added some assumptions that were not clearly logical. This step then raised the question of whether Russell's repair of Frege's system could still be counted as fulfilling the logicist program; Russell, optimistically, believed that it did."
#Tarski #Russell #PrincipiaMathematica

Issac Newton (1687) Why You Don’t Float Away
https://multiverseemployeehandbook.com/blog/when-newton-explained-why-you-dont-float-away
https://news.ycombinator.com/item?id=44477768

Philosophiæ Naturalis Principia Mathematica
https://en.wikipedia.org/wiki/Philosophi%C3%A6_Naturalis_Principia_Mathematica

Not to be confused with

Humanist philosopher/mathematician Bertrand Russell
https://en.wikipedia.org/wiki/Bertrand_Russell
https://en.wikipedia.org/wiki/Principia_Mathematica
https://en.wikipedia.org/wiki/Category:Essays_by_Bertrand_Russell

#IssacNewton #BertrandRussell #mathematics #PrincipiaMathematica #philosophy

he’d like to walk and talk about it some more

Derek’s Thoughts on Bodies in Motion
Jonathan Humble

#Poetry #JonathanHumble #TheFridayPoem #IsaacNewton #PrincipiaMathematica #Lincolnshire #Literature #Physics

https://thefridaypoem.com/dereks-thoughts-on-bodies-in-motion/

Contraddizione sul moto inerziale in meccanica classica. Scoperto un errore nella traduzione della Prima Legge di Newton dopo quasi 300 anni. Una nuova interpretazione degli scritti di Isaac Newton chiarisce cosa intendesse il padre della meccanica classica con la sua prima legge del moto:..

#dinamica #inerzia
#IsaacNewton #leggedelmoto #leggidiNewton #meccanicaclassica #meccanicaquantistica #PhilosophiaeNaturalis #PrincipiaMathematica #reazione

https://scienzamagia.eu/scienza-tecnologia/contraddizione-sul-moto-inerziale-in-meccanica-classica/