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2. Hadwiger–Nelson problem - Wikipedia

   en.wikipedia.org/wiki/Hadwiger–Nelson_problem

   According to Jensen & Toft (1995), the problem was first formulated by Nelson in 1950, and first published by Gardner (1960). Hadwiger (1945) had earlier published a related result, showing that any cover of the plane by five congruent closed sets contains a unit distance in one of the sets, and he also mentioned the problem in a later paper (Hadwiger 1961).

3. Range of a function - Wikipedia

   en.wikipedia.org/wiki/Range_of_a_function

   with domain, the range of , sometimes denoted ⁡ or ⁡ (), [4] may refer to the codomain or target set (i.e., the set into which all of the output of is constrained to fall), or to (), the image of the domain of under (i.e., the subset of consisting of all actual outputs of ). The image of a function is always a subset of the codomain of the ...

4. Category theory - Wikipedia

   en.wikipedia.org/wiki/Category_theory

   A category is formed by two sorts of objects: the objects of the category, and the morphisms, which relate two objects called the source and the target of the morphism. Metaphorically, a morphism is an arrow that maps its source to its target. Morphisms can be composed if the target of the first morphism equals the source of the second one.

5. Everyday Mathematics - Wikipedia

   en.wikipedia.org/wiki/Everyday_Mathematics

   Everyday Mathematics curriculum was developed by the University of Chicago School Math Project (or UCSMP ) [1] which was founded in 1983. Work on it started in the summer of 1985. The 1st edition was released in 1998 and the 2nd in 2002. A third edition was released in 2007 and a fourth in 2014-2015. [2]

6. Mathcounts - Wikipedia

   en.wikipedia.org/wiki/Mathcounts

   The Mathcounts Competition Series spread quickly in middle schools, and today it is the best-known middle school mathematics competition. [5] In 2007 Mathcounts launched the National Math Club as a noncompetitive alternative to the Competition Series. In 2011, Mathcounts launched the Math Video Challenge Program, which was discontinued in 2023 ...

7. Lecture Notes in Mathematics - Wikipedia

   en.wikipedia.org/wiki/Lecture_Notes_in_Mathematics

   Lecture Notes in Mathematics is a book series in the field of mathematics, including articles related to both research and teaching. It was established in 1964 and was edited by A. Dold, Heidelberg and B. Eckmann, Zürich. Its publisher is Springer Science+Business Media (formerly Springer-Verlag).

8. Multivariate statistics - Wikipedia

   en.wikipedia.org/wiki/Multivariate_statistics

   Multivariate statistics is a subdivision of statistics encompassing the simultaneous observation and analysis of more than one outcome variable, i.e., multivariate random variables.

9. Duckworth–Lewis–Stern method - Wikipedia

   en.wikipedia.org/wiki/Duckworth–Lewis–Stern...

   A rain delay at The Oval, England Scoreboard at Trent Bridge indicating that bad light has stopped play.. The Duckworth–Lewis–Stern method (DLS method or DLS) previously known as the Duckworth–Lewis method (D/L) is a mathematical formulation designed to calculate the target score (number of runs needed to win) for the team batting second in a limited overs cricket match interrupted by ...