A list of unsolved problems may refer to several conjectures or open problems in various fields: Unsolved problems in artificial intelligence Unsolved problems in biology Unsolved problems in chemistry Unsolved problems in computer science Unsolved problems in economics Unsolved problems in geoscience Unsolved problems in information theory Unsolved problems in linguistics Unsolved problems in mathematics Unsolved problems in medicine Unsolved problems in neuroscience Unsolved problems in philosophy Unsolved problems in physics Unsolved problems in statistics