Keywords: Pxs1splittedbis.PNG Math Juan Manuel Márquez B Category Mathematics This image represents part of the projective plane <math>\mathbb R P 2</math>decomposed into three disks <math>D_1 D_2 D_3</math> to illustrate how to split the product <math>\mathbb R P 2\times S 1</math> into three solid tori <math>V_1 V_2 V_3</math> Geometric topology 3-manifolds |