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2. Portal:Mathematics - Wikipedia

   en.wikipedia.org/wiki/Portal:Mathematics

   The manipulations of the Rubik's Cube form the Rubik's Cube group. In mathematics, a group is a set with an operation that associates an element of the set to every pair of elements of the set (as does every binary operation) and satisfies the following constraints: the operation is associative, it has an identity element, and every element of the set has an inverse element.

3. Digamma function - Wikipedia

   en.wikipedia.org/wiki/Digamma_function

   The digamma function (), visualized using domain coloring Plots of the digamma and the next three polygamma functions along the real line (they are real-valued on the real line)

4. Pentation - Wikipedia

   en.wikipedia.org/wiki/Pentation

   The first three values of the expression x[5]2.The value of 3[5]2 is about 7.626 × 10 12; values for higher x, such as 4[5]2, which is about 2.361 × 10 8.072 × 10 153 are much too large to appear on the graph.

5. Singularity (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Singularity_(mathematics)

   In mathematics, a singularity is a point at which a given mathematical object is not defined, or a point where the mathematical object ceases to be well-behaved in some particular way, such as by lacking differentiability or analyticity.

6. Euler's constant - Wikipedia

   en.wikipedia.org/wiki/Euler's_constant

   The area of the blue region converges to Euler's constant. Euler's constant (sometimes called the Euler–Mascheroni constant) is a mathematical constant, usually denoted by the lowercase Greek letter gamma (γ), defined as the limiting difference between the harmonic series and the natural logarithm, denoted here by log:

7. Curta - Wikipedia

   en.wikipedia.org/wiki/Curta

   The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.