Des chiffres et des maths
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Un chiffre est un signe d'écriture utilisé seul ou en combinaison pour représenter des nombres entiers.
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Les signes "+" et "-" apparaissent dans l'Arithmétique commerciale de Widmann en 1489. Les signes de multiplication et de division actuels ne sont introduits qu'au XVIIème siècle.
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RETOUR DES CHIFFRES ET DES MATHS http://philatelier.over-blog.com/2021/12/des-chiffres-et-des-maths.html
RETOUR INDEX SOMMAIRE http://philatelier.over-blog.com/2015/08/index-sommaire.html