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Edge-notched card used as a library card. Edges not notched here. McBee Keysort card (1932 – 1980s): front and rear, with instructional diagram on rear. Cards existed in many variants, with differing sizes and numbers of rows of holes. The center of the card could be blank for information to be written onto, or contain a pre-printed form.
There are many longstanding unsolved problems in mathematics for which a solution has still not yet been found. The notable unsolved problems in statistics are generally of a different flavor; according to John Tukey, [1] "difficulties in identifying problems have delayed statistics far more than difficulties in solving problems."
Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.
Determining whether a Turing machine is a busy beaver champion (i.e., is the longest-running among halting Turing machines with the same number of states and symbols). Rice's theorem states that for all nontrivial properties of partial functions, it is undecidable whether a given machine computes a partial function with that property.
Here are the answers to some of the most common questions about scam phone numbers. How can I check if a phone number is a scam? Search the phone number you suspect is a scam on Google.
For example, 40000 (number) has a section Selected numbers, in this case for numbers in the range 40001–49999. Such sections also list integers in the given range that are not sufficiently notable to warrant their own, separate article, but nevertheless have a property that is interesting enough to mention it there.