. ▁R ., ▁ 2 0 0 0 . ▁Con cept ual ▁Ro ots ▁of ▁Mathemat ics . ▁Rout ledge . ▁Ch pt . ▁ 1 0 , ▁on ▁" pro tot op ology ," ▁discuss es ▁White head ' s ▁systems ▁and ▁is ▁strongly ▁influenced ▁by ▁the ▁un pub lished ▁writ ings ▁of ▁David ▁B ost ock . ▁ ▁Ro eper , ▁P ., ▁ 1 9 9 7 , ▁" Region - B ased ▁Top ology ," ▁Journal ▁of ▁Philosoph ical ▁Log ic ▁ 2 6 : ▁ 2 5 1 - 3 0 9 . ▁ ▁Sim ons , ▁P ., ▁ 1 9 8 7 . ▁Part s : ▁A ▁Study ▁in ▁Ont ology . ▁Oxford ▁Un iv . ▁Press . ▁ ▁White head , ▁A . N ., ▁ 1 9 1 6 , ▁" La ▁The orie ▁Rel ation iste ▁de ▁l ' E space ," ▁Rev ue ▁de ▁Met aph ys ique ▁et ▁de ▁Mor ale ▁ 2 3 : ▁ 4 2 3 - 4 5 4 . ▁Trans l ated ▁as ▁Hur ley , ▁P . J ., ▁ 1 9 7 9 , ▁" The ▁rel ational ▁theory ▁of ▁space ," ▁Philosoph y ▁Research ▁Archives ▁ 5 : ▁ 7 1 2 - 7 4 1 . ▁- ------- , <0x09> 1 9 1 9 . ▁An ▁En qu iry ▁Conc ern ing ▁the ▁Princi ples ▁of ▁Natural ▁Know ledge . ▁Cambridge ▁Un iv . ▁Press . ▁ 2 nd ▁ed ., ▁