Clear and Concise. Varberg focuses on the most critical concepts.   This popular calculus text remains the shortest mainstream calculus book available -- yet covers all relevant material needed by, and appropriate to, the study of calculus at this level. It's conciseness and clarity helps you focus on, and understand, critical concepts in calculus without them getting bogged down and lost in excessive and unnecessary detail. It is accurate, without being excessively rigorous, up-to-date without being faddish.