# Corrections to “Winding Around”

• Page 24, Figure 2.1; the coordinate $$\phi(P)$$ should be $$x/(1-y)$$, not $$y/(1-x)$$.
• Page 123, Displayed equation in the proof of Proposition 7.1.3, $$\sum \lambda_i v_i$$ should be $$\sum \lambda_i w_i$$.
• Page 137, Exercise 7.5.5 the display $$\int k(x,y) f(x)$$ should read $$\int k(x,y) f(y) dy$$.  The rest of the question is unchanged (this integral appears only in an explanatory historical aside)