**Leonardo Pisano (of Pisa) called Fibonacci **(son of Bonacci family) 1170-1250
Liber Abaci (Book of Calculation) 1202: *Hindo-Arabic numerals* Modus Indorum (Method of Indians)
Many arithmetical and algebraic examples: a problem about rabbits leaded to the Fibonacci sequence 1,2,3,5,8,13,… problems about perfect numbers, Chineese remainder theorem, sum of arith/geom series
Practica geometriae 1220: geometry problems based on Euclid’s Elements
Flos 1220: approximation to a root of 10x+2x^{2}+x^{3}=20 (asked by Johannes of Palermo, problem from Omar Khayyam’s book)
Liber Quadratorium 1225 the most impressive work: 1+3+5+…; on Pythagorean triples; both x^{2}+y^{2} and x^{2}-y^{2} cannot be squares at the same time; x^{4}-y^{4} cannot be a square; (a^{2}+b^{2})(c^{2}+d^{2})=(ab+cd)^{2}+(ad-bc)^{2 }
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