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  2. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.

  3. Serial sevens - Wikipedia

    en.wikipedia.org/wiki/Serial_sevens

    Serial sevens (or, more generally, the descending subtraction task; DST), where a patient counts down from one hundred by sevens, is a clinical test used to test cognition; for example, to help assess mental status after possible head injury, in suspected cases of dementia or to show sleep inertia.

  4. Reverse mathematics - Wikipedia

    en.wikipedia.org/wiki/Reverse_mathematics

    Reverse mathematics is a program in mathematical logic that seeks to determine which axioms are required to prove theorems of mathematics. Its defining method can briefly be described as "going backwards from the theorems to the axioms", in contrast to the ordinary mathematical practice of deriving theorems from axioms.

  5. Little Professor - Wikipedia

    en.wikipedia.org/wiki/Little_Professor

    The Little Professor is a backwards-functioning calculator designed for children ages 5 to 9. Instead of providing the answer to a mathematical expression entered by the user, it generates unsolved expressions and prompts the user for the answer.

  6. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Tally marks: Usually used for counting things that increase by small amounts and do not change very quickly. Fractions: A representation of a non-integer as a ratio of two integers. These include improper fractions as well as mixed numbers.

  7. Palindromic number - Wikipedia

    en.wikipedia.org/wiki/Palindromic_number

    A palindromic number (also known as a numeral palindrome or a numeric palindrome) is a number (such as 16361) that remains the same when its digits are reversed.In other words, it has reflectional symmetry across a vertical axis.