an ▁dual ) ▁sol ids ". ▁On ▁Page ▁ 8 0 ▁he ▁describes ▁the ▁th ir teen ▁Arch im ede ans ▁as ▁sem ire g ular , ▁while ▁on ▁P ages ▁ 3 6 7 ▁ff . ▁he ▁discuss es ▁the ▁Catal ans ▁and ▁their ▁relationship ▁to ▁the ▁' sem ire g ular ' ▁Arch im ede ans . ▁By ▁imp lication ▁this ▁tre ats ▁the ▁Catal ans ▁as ▁not ▁sem ire g ular , ▁thus ▁effectively ▁contradict ing ▁( or ▁at ▁least ▁confusing ) ▁the ▁definition ▁he ▁provided ▁in ▁the ▁earlier ▁foot note . ▁He ▁ign ores ▁non con vex ▁poly hed ra . ▁ ▁See ▁also ▁ ▁Sem ire g ular ▁poly to pe ▁ ▁Reg ular ▁poly hed ron ▁ ▁References ▁ ▁External ▁links ▁▁▁▁ ▁George ▁Hart : ▁Arch im ede an ▁Sem i - regular ▁Poly hed ra ▁ ▁David ▁Dar ling : ▁semi - regular ▁poly hed ron ▁ ▁poly hed ra . math mos . net : ▁Sem i - Reg ular ▁Poly hed ron ▁ ▁Encyc lo pa edia ▁of ▁Mathemat ics : ▁Sem i - regular ▁poly hed ra , ▁uniform ▁poly hed ra , ▁Arch im ede an ▁sol ids ▁ ▁Category : Pol y hed ra <0x0A> </s> ▁May so on ▁al - E ry ani ▁( born ▁ 2 4 ▁November ▁ 1 9 8 7 ) ▁is ▁a ▁poet ▁and ▁transl ator ▁from ▁Y emen , ▁who ▁writes ▁in ▁Arab ic ▁and ▁English . ▁She ▁was ▁born ▁in ▁S ana '