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2. Floor and ceiling functions - Wikipedia

   en.wikipedia.org/wiki/Floor_and_ceiling_functions

   In mathematics, the floor function is the function that takes as input a real number x, and gives as output the greatest integer less than or equal to x, denoted ⌊x⌋ or floor(x). Similarly, the ceiling function maps x to the least integer greater than or equal to x, denoted ⌈x⌉ or ceil(x). [1]

3. List of unsolved problems in mathematics - Wikipedia

   en.wikipedia.org/wiki/List_of_unsolved_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.

4. Ceiling effect (statistics) - Wikipedia

   en.wikipedia.org/wiki/Ceiling_effect_(statistics)

   An example of use in the first area, a ceiling effect in treatment, is pain relief by some kinds of analgesic drugs, which have no further effect on pain above a particular dosage level (see also: ceiling effect in pharmacology). An example of use in the second area, a ceiling effect in data-gathering, is a survey that groups all respondents ...

5. Threshold graph - Wikipedia

   en.wikipedia.org/wiki/Threshold_graph

   A graph is a threshold graph if and only if it is both a cograph and a split graph. Every graph that is both a trivially perfect graph and the complementary graph of a trivially perfect graph is a threshold graph. Threshold graphs are also a special case of interval graphs. All these relations can be explained in terms of their characterisation ...

6. Judge releases woman who stabbed a classmate to please ...

   www.aol.com/news/judge-releases-woman-stabbed...

   MADISON, Wis. (AP) — A Wisconsin woman who at age 12 stabbed her sixth-grade classmate nearly to death to please online horror character Slender Man will be released from a psychiatric hospital ...

7. Advanced level mathematics - Wikipedia

   en.wikipedia.org/wiki/Advanced_level_mathematics

   Advanced Level (A-Level) Mathematics is a qualification of further education taken in the United Kingdom (and occasionally other countries as well). In the UK, A-Level exams are traditionally taken by 17-18 year-olds after a two-year course at a sixth form or college .