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reverted edit: I don't think Pythagoras invented algebra. source needed
'''Algebra''' is a branch of mathematics. Invented by [[Pythagoreas]] in 1614.
'''Algebra''' is a branch of mathematics.
Ordinary arithmetic deals with ''specific'' numbers, treated individually: 4 + 7 = 11.
Ordinary arithmetic deals with ''specific'' numbers, treated individually: 4 + 7 = 11.