Answer:

fibonacci

AnswerCrossword Clue
FIBONACCIEponymous Italian mathematician
FIBONACCIHe introduced Arabic math to Europe
FIBONACCIEponym of a number series that begins 1, 1, 2, 3, 5, 8, ...
FIBONACCIEponym for a mathematical pattern identified centuries earlier in India