ann ual - report - 2 0 1 8 ▁▁ ▁Category : Ret ail ▁companies ▁of ▁Switzerland ▁Category : Ret ail ▁companies ▁of ▁Brazil ▁Category : Comp an ies ▁listed ▁on ▁the ▁S IX ▁Swiss ▁Exchange ▁Category : Comp an ies ▁listed ▁on ▁the ▁São ▁Paulo ▁Stock ▁Exchange ▁Category : Ret ail ▁companies ▁established ▁in ▁ 1 8 6 5 ▁Category : 1 8 6 5 ▁establish ments ▁in ▁Switzerland ▁Category : Comp an ies ▁based ▁in ▁Bas el ▁Category : D ut y - free ▁sh ops <0x0A> </s> ▁T aking ▁Sud oku ▁Ser iously : ▁The ▁math ▁behind ▁the ▁world ' s ▁most ▁popular ▁p enc il ▁puzz le ▁is ▁a ▁book ▁on ▁the ▁mathematics ▁of ▁Sud oku . ▁It ▁was ▁written ▁by ▁Jason ▁Rosen house ▁and ▁Laura ▁Ta al man , ▁and ▁published ▁in ▁ 2 0 1 1 ▁by ▁the ▁Oxford ▁University ▁Press . ▁The ▁Basic ▁Library ▁List ▁Committee ▁of ▁the ▁Mathemat ical ▁Association ▁of ▁America ▁has ▁suggested ▁its ▁inclusion ▁in ▁under grad uate ▁mathematics ▁libraries . ▁It ▁was ▁the ▁ 2 0 1 2 ▁winner ▁of ▁the ▁PRO SE ▁Awards ▁in ▁the ▁popular ▁science ▁and ▁popular ▁mathematics ▁category . ▁ ▁Top ics ▁The ▁book ▁is ▁centered ▁around ▁Sud oku ▁puzz les , ▁using ▁them ▁as ▁a ▁jump ing - off ▁point ▁" to ▁discuss ▁a ▁broad ▁spectrum ▁of ▁topics ▁in ▁mathematics ". ▁In ▁many ▁cases ▁these ▁topics ▁are ▁presented ▁through ▁simplified ▁examples ▁which ▁can ▁be ▁understood ▁by ▁hand ▁calculation ▁before ▁extending ▁them ▁to ▁Sud oku ▁itself ▁using ▁computers