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2. Ulam spiral - Wikipedia

   en.wikipedia.org/wiki/Ulam_spiral

   Klauber's 1932 paper describes a triangle in which row n contains the numbers (n − 1) 2 + 1 through n 2. As in the Ulam spiral, quadratic polynomials generate numbers that lie in straight lines. Vertical lines correspond to numbers of the form k 2 − k + M. Vertical and diagonal lines with a high density of prime numbers are evident in the ...

3. Coin rotation paradox - Wikipedia

   en.wikipedia.org/wiki/Coin_rotation_paradox

   The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...

4. Rotational symmetry - Wikipedia

   en.wikipedia.org/wiki/Rotational_symmetry

   In addition to an n-fold axis, n perpendicular 2-fold axes: the dihedral groups D n of order 2n (n ≥ 2). This is the rotation group of a regular prism , or regular bipyramid . Although the same notation is used, the geometric and abstract D n should be distinguished: there are other symmetry groups of the same abstract group type which are ...

5. Orientation (geometry) - Wikipedia

   en.wikipedia.org/wiki/Orientation_(geometry)

   Changing orientation of a rigid body is the same as rotating the axes of a reference frame attached to it. In geometry, the orientation, attitude, bearing, direction, or angular position of an object – such as a line, plane or rigid body – is part of the description of how it is placed in the space it occupies. [1]

6. Multiplication algorithm - Wikipedia

   en.wikipedia.org/wiki/Multiplication_algorithm

   If a positional numeral system is used, a natural way of multiplying numbers is taught in schools as long multiplication, sometimes called grade-school multiplication, sometimes called the Standard Algorithm: multiply the multiplicand by each digit of the multiplier and then add up all the properly shifted results.

7. NYT ‘Connections’ Hints and Answers Today, Tuesday, January 7

   www.aol.com/nyt-connections-hints-answers-today...

   Related: The 26 Funniest NYT Connections Game Memes You'll Appreciate if You Do This Daily Word Puzzle. Hints About Today's NYT Connections Categories on Tuesday, January 7. 1. Related to group or ...