@geoclidean Has to be an equal number of boys and girls with the desired property. Insert again the boy and the girl. If the 2 people who where next to eachother after removing were of the same gender, then the number doesnt change. If they were of different gender, the number doesnt change.
@geoclidean Proceed by induction on n (number of boys or girls). The base case is clear. Assume its true for n. Let the circle of 2(n+1) people be as stated. There must be a bow with a girl to his right; remove them. By the induct. hip. We know that in the remaining circle of 2n people there
@pinkieswop Sí, el libro empieza con curvas paramétricas en R^2 y R^3, velocidad y longitud de curva. Lo único que el libro asume que sabes es cálculo (y saber demostrar un poco). De igual manera si sientes que no estás entendiendo los ejercicios están para ayudarte