| Link | Quote | Stars | Tags | Author |
| 637eee3 | From this proposition it will follow, when arithmetical addition has been defined, that 1+12. | Principia Mathematica |
| Link | Quote | Stars | Tags | Author |
| 637eee3 | From this proposition it will follow, when arithmetical addition has been defined, that 1+12. | Principia Mathematica |