A significant work on mathematical reasoning by G. Polya. - Title: How to Solve It? Mathematics and Plausible Reasoning Volume 1 & 2 - Author: G. Polya - Language: Japanese - Contents: Induction and analogy in mathematics, patterns of reasoning - Condition: Shows signs of aging - Maruzen Co., Ltd. This item was found during the disposal of belongings. There is staining and sun damage due to aging. Please understand this before purchasing. Thank you for viewing.