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2. Kőnig's theorem (set theory) - Wikipedia

   en.wikipedia.org/wiki/König's_theorem_(set_theory)

   In set theory, Kőnig's theorem states that if the axiom of choice holds, I is a set, and are cardinal numbers for every i in I, and < for every i in I, then <. The sum here is the cardinality of the disjoint union of the sets m i, and the product is the cardinality of the Cartesian product.

3. Wagon-wheel effect - Wikipedia

   en.wikipedia.org/wiki/Wagon-wheel_effect

   Imagine that the true rotation of a four-spoke wheel is clockwise. [3] The first instance of visibility of the wheel may occur when one spoke is at 12 o'clock. If by the time the next instance of visibility occurs, the spoke previously at 9 o'clock has moved into the 12-o'clock position, then a viewer will perceive the wheel to be stationary.

4. Karl König - Wikipedia

   en.wikipedia.org/wiki/Karl_König

   Karl König with his professors in Vienna, 1925. König was born in Vienna, in Austria-Hungary, on 25 September 1902, the only son of a Jewish shoemaker.He studied medicine at the University of Vienna and graduated in 1927 with a special interest in embryology.

5. Spoke wrench - Wikipedia

   en.wikipedia.org/wiki/Spoke_wrench

   A spoke wrench that fits three common nipple sizes. A spoke wrench or spoke key is a small wrench or tool used to adjust the tension in the spokes of a tension-spoked wheel.A spoke wrench is sometimes called a nipple wrench, as it is the spoke nipple – not the spoke – that is turned in the process of changing the tension of a spoke.

6. Kőnig's theorem (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Kőnig's_theorem_(graph...

   An example of a bipartite graph, with a maximum matching (blue) and minimum vertex cover (red) both of size six. In the mathematical area of graph theory, Kőnig's theorem, proved by Dénes Kőnig (), describes an equivalence between the maximum matching problem and the minimum vertex cover problem in bipartite graphs.

7. Crescent (brand) - Wikipedia

   en.wikipedia.org/wiki/Crescent_(brand)

   [4] [5] There was a rumor that Richard Evelyn Byrd, on his initial journey to Alaska, had a Crescent wrench in his provisions. [3] The Crescent Tool Company was acquired by a group of investors from Schoellkopf, Hutton & Pomeroy in 1960 after Marvin Peterson, Karl's son, sold it. [5] The combined company was renamed the Crescent Niagara ...