Mexico: Bonilla Artigas Editores (Colección Textopías; 3), 2018. First Edition. Paperback. 189p., photos, graphics, bibl., wrps. For Lewis Carroll, nights were a time of creative activity. Between 1872 and 1890, he thought of and solved the 72 problems in geometry, algebraic geometry, algebra, differential calculus, and transcendental probabilities and arithmetic..... More about Problemas de cabecera. Pensadores durante las horas de vigilia