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Dattatreya Ramchandra Kaprekar (Marathi: दत्तात्रेय रामचंद्र कापरेकर; 17 January 1905 – 1986) was an Indian recreational mathematician who described several classes of natural numbers including the Kaprekar, harshad and self numbers and discovered the Kaprekar's constant, named after him. [1]
HegartyMaths was created by co-founders and teachers Colin Hegarty and Brian Arnold. In 2011 they started to make maths videos on YouTube to support their own classes with maths homework and revision. Since the videos were freely available on YouTube, students from all over the country and the world started using the videos too.
A k-path is a k-tree with at most two leaves, and a k-caterpillar is a k-tree that can be partitioned into a k-path and some k-leaves, each adjacent to a separator k-clique of the k-path. In this terminology, a 1-caterpillar is the same thing as a caterpillar tree, and k-caterpillars are the edge-maximal graphs with pathwidth k. [6]
Hatch marks (also called hash marks or tick marks) are a form of mathematical notation. They are used in three ways as: Unit and value marks — as on a ruler or number line; Congruence notation in geometry — as on a geometric figure; Graphed points — as on a graph; Hatch marks are frequently used as an abbreviation of some common units of ...
An infinite sequence of real numbers (in blue). This sequence is neither increasing, decreasing, convergent, nor Cauchy. It is, however, bounded. In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed and order matters. Like a set, it contains members (also called elements, or terms).
The second, Eddie Woo's Magical Maths, is a children's activity book. In September 2022, Woo co-hosted high-school television series Ultimate Classroom , an educational STEM competition sponsored by the Australian Defence Force , [ 12 ] alongside presenter Stephanie Bendixsen .
Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system . They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate results need to be erased or discarded.
A sequence is a function on the natural numbers, so every sequence ,, … in a topological space can be considered a net in defined on . Conversely, any net whose domain is the natural numbers is a sequence because by definition, a sequence in X {\displaystyle X} is just a function from N = { 1 , 2 , … } {\displaystyle \mathbb {N} =\{1,2 ...