Notes for LD15 Schneps-2/0:28:34

The formula on the board should really read [math]\displaystyle{ dur.pal=pal\cdot dupal }[/math], where [math]\displaystyle{ dur.A(u_1,\ldots,u_r)=(u_1+\cdots+u_r)A(u_1,\ldots,u_r) }[/math].