Calculus, Volume 1

The two volumes of Apostol's "Calculus" must be linked to his "Mathematical Analysis".I consider "Mathematical Analysis" as the third volume, complement to Apostol's famous two-volume "Calculus", forming his trilogy of analysis.Apostol's clarity and precision of exposition are simply unbeatable and his trilogy is to stand high in the collection of anyone interested in mathematics.To my knowledge, there's only one comparable SUM in analysis, i.e. Edouard Goursat's three-volume "A course in Mathematical Analysis", older (1902), deeper and therefore less easy to absorb, but a definitely lucid and a fundamental classic.