Person: AlUmawi
AlUmawi was a Spanishborn Islamic mathematician who wrote works on mensuration and arithmetic.
Mathematical Profile (Excerpt):
 If alUmawi wrote his manuscript before 1373 he cannot have lived to 1489 so one date must be incorrect but there is no other evidence as to which is correct and which is wrong.
 It is usual to regard alUmawi as a 14th century mathematician and we have given rough dates based on the assumption that the manuscript date is correct.
 Although alUmawi lived in Damascus in Syria, he came from Andalusia in the south of Spain.
 Indeed alUmawi was a Muslim but the mathematical scholarship of the Muslim world at this time was certainly not uniform.
 There were differences in the numerals used in western areas (which alUmawi came from) and those used in the east.
 Indeed some scholars find it surprising that alUmawi as a westerner wrote an arithmetic text for those in the east.
 Two texts by alUmawi which have survived are Marasim alintisab fi'ilm alhisab (On arithmetical rules and procedures), and Raf'alishkal fi ma'rifat alashkal which is a work on mensuration.
 Before describing the Marasim we should make some brief comments about alUmawi's work calculating lengths and areas.
 In it alUmawi gives rules for calculating: lengths of chords and lengths of arcs of circles (using Pythagoras's theorem); areas of circles, areas of segments of circles, areas of triangles and quadrilaterals; volumes of spheres, volumes of cones and volumes of prisms.
 After describing the very briefly the basic arithmetical operations of addition and multiplication, alUmawi moves on to discuss the summation of series.
 Among the series alUmawi considers are arithmetic and geometric series.
 These sums of polygonal numbers are called pyramidal numbers and alUmawi then considers the sums of the first nnn pyramidal numbers.
 AlUmawi then describes casting out sevens, eights, nines, and elevens.
 This theorem is attributed to Pascal three hundred years after alUmawi, and indeed alUmawi only gives the special cases mention here.
 Some results appearing in this work by alUmawi are not found in any other Arabic arithemetics.
 If you have enjoyed proving these results due to alUmawi then here is one more he gives in the Marasim.
Born about 1400, possibly Andalusia (now Spain). Died 1489, possibly Damascus, Syria.
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Origin Spain
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References
Adapted from other CC BYSA 4.0 Sources:
 Oâ€™Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive