- Arithmetic (Wikipedia)
Arithmetic (from Ancient Greek ἀριθμός (arithmós) ’number’, and τική [τέχνη] (tikḗ [tékhnē]) ‘art, craft’) is an elementary part of mathematics that consists of the study of the properties of the traditional operations on numbers—addition, subtraction, multiplication, division, exponentiation, and extraction of roots. In the 19th century, Italian mathematician Giuseppe Peano formalized arithmetic with his Peano axioms, which are highly important to the field of mathematical logic today.
If there is in this world a well-attested account, it is that of vampires. Nothing is lacking: official reports, affidavits of well-known people, of surgeons, of priests, of magistrates; the judicial proof is most complete. And with all that, who is there who believes in vampires?
Jean-Jacques RousseauMan is born free; and everywhere he is in chains.
Jean-Jacques Rousseau, The Social Contract
- The Social Contract (Wikipedia)
The Social Contract, originally published as On the Social Contract; or, Principles of Political Right (French: Du contrat social; ou, Principes du droit politique), is a 1762 French-language book by the Genevan philosopher Jean-Jacques Rousseau. The book theorizes about how to establish legitimate authority in a political community, that is, one compatible with individual freedom, in the face of the problems of commercial society, which Rousseau had already identified in his Discourse on Inequality (1755).