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  2. Connect the dots - Wikipedia

    en.wikipedia.org/wiki/Connect_the_dots

    The Nine Dots Puzzle is the first known puzzle game where the player has to connect dots. But in this variant the goal is not to draw a picture, but to solve a logic puzzle. The emergence of connect the dots games in the printed press takes place in the early 20th century.

  3. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/lifestyle/10-hard-math-problems-even...

    Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

  4. Road coloring theorem - Wikipedia

    en.wikipedia.org/wiki/Road_coloring_theorem

    Let G be a finite, strongly connected, directed graph where all the vertices have the same out-degree k.Let A be the alphabet containing the letters 1, ..., k.A synchronizing coloring (also known as a collapsible coloring) in G is a labeling of the edges in G with letters from A such that (1) each vertex has exactly one outgoing edge with a given label and (2) for every vertex v in the graph ...

  5. The Dot and the Line - Wikipedia

    en.wikipedia.org/wiki/The_Dot_and_the_Line

    The Dot and the Line: A Romance in Lower Mathematics is a 1965 animated short film directed by Chuck Jones and co-directed by Maurice Noble, based on the 1963 book of the same name written and illustrated by Norton Juster, who also provided the film's script.

  6. Graph coloring - Wikipedia

    en.wikipedia.org/wiki/Graph_coloring

    Graph coloring is computationally hard. It is NP-complete to decide if a given graph admits a k-coloring for a given k except for the cases k ∈ {0,1,2}. In particular, it is NP-hard to compute the chromatic number. [33] The 3-coloring problem remains NP-complete even on 4-regular planar graphs. [34]

  7. Multiplication sign - Wikipedia

    en.wikipedia.org/wiki/Multiplication_sign

    u+22c5 ⋅ dot operator U+00F7 ÷ DIVISION SIGN The multiplication sign ( × ), also known as the times sign or the dimension sign , is a mathematical symbol used to denote the operation of multiplication , which results in a product .

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