Fu Caiguan is an author about whom little information is publicly available; his nationality, dates of birth and death, and personal history cannot be confirmed, and no English name has been recorded. Within the available records, two works appear under his name: Calculus I and Calculus II. Both are basic mathematics textbooks, commonly classified under popular science and examination preparation. Judging from their titles and subject matter, Fu Caiguan's writing centers on introductory higher mathematics, covering the fundamental concepts, computational methods, and problem-solving practice of calculus of one variable, aimed at students and exam candidates. Textbooks of this kind typically favor clear organization and paired examples and exercises, helping readers build knowledge step by step. Because public information is limited, further details about the author's academic background and writing style cannot be added.