180 元券9789811255328预订CalculusUmbral¥10330去看看中国国际图书专营店发布了【预订】Guide to the Umbral Calculus 9789811255328107 元券9789811255328MathematicalDifferentCalculus¥9580去看看澜瑞图书专营店发布了【3-4周达】Guide to the Umbral Calculus, a Different Mathematical Language [9789811255328]