Abstract
SUMMARY: In his Livre d'Arithmeticque, edited at Antwerp in 1561, Valentin Mennher set 100 problems on arithmetic and trigonometry, followed by the 'facit'. It was known that Michiel Coignet wrote a treatise on these problems under the title Cent Questions Ingeniveuses..., Antwerp 1573, but there was only one copy of
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