Main Page | See live article | Alphabetical index List of unsolved problems This is a list of lists of unsolved problems in various subjects: Unsolved problems in mathematics Unsolved problems in physics Unsolved problems in chemistry Unsolved problems in biology Unsolved problems in economics Unsolved problems in cognitive science Unsolved problems in neuroscience Unsolved problems in computer science Unsolved problems in software engineering This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.