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  2. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The colored arcs divide each edge in the golden ratio; when two tiles share an edge, their arcs must match. The golden ratio appears prominently in the Penrose tiling , a family of aperiodic tilings of the plane developed by Roger Penrose , inspired by Johannes Kepler 's remark that pentagrams, decagons, and other shapes could fill gaps that ...

  3. Euclid's lemma - Wikipedia

    en.wikipedia.org/wiki/Euclid's_lemma

    Euclid's lemma — If a prime p divides the product ab of two integers a and b, then p must divide at least one of those integers a or b. For example, if p = 19 , a = 133 , b = 143 , then ab = 133 × 143 = 19019 , and since this is divisible by 19, the lemma implies that one or both of 133 or 143 must be as well.

  4. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    This slide rule is positioned to yield several values: From C scale to D scale (multiply by 2), from D scale to C scale (divide by 2), A and B scales (multiply and divide by 4), A and D scales (squares and square roots). In addition to the logarithmic scales, some slide rules have other mathematical functions encoded on other auxiliary scales.

  5. Formula for primes - Wikipedia

    en.wikipedia.org/wiki/Formula_for_primes

    For n = 40, it produces a square number, 1681, which is equal to 41 × 41, the smallest composite number for this formula for n ≥ 0. If 41 divides n , it divides P ( n ) too. Furthermore, since P ( n ) can be written as n ( n + 1) + 41, if 41 divides n + 1 instead, it also divides P ( n ).

  6. Frequency divider - Wikipedia

    en.wikipedia.org/wiki/Frequency_divider

    Divide by 2, and asynchronous 2 N Ripple Counter dividers - Electronics Tutorials; Synchronous divide by 3, 6, 9, 12 with 50% duty cycle output - ON Semiconductor - Archived; Synchronous divide by 3 or 5 with 50% duty cycle output, and divide by 1.5 & 2.5 circuits - Xilinx - Archived; Divide by N-0.5 using 74x161 counters - Whitepaper

  7. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    The result is the same as the result of 40 divided by 5(40/5 = 8). If the last digit in the number is 5, then the result will be the remaining digits multiplied by two, plus one. For example, the number 125 ends in a 5, so take the remaining digits (12), multiply them by two (12 × 2 = 24), then add one (24 + 1 = 25).

  8. Aortic valve area calculation - Wikipedia

    en.wikipedia.org/wiki/Aortic_valve_area_calculation

    This gives an LV stroke volume of 3.14 * 24 = 75.40 cc. Divide the LV stroke volume, 75.40 cc by the Aortic Valve VTI, 50 cm and this gives an aortic valve area of 75.40 / 50 = 1.51 cm 2. The weakest aspect of this calculation is the variability in measurement of LVOT area, because it involves squaring the LVOT dimension.

  9. Highest averages method - Wikipedia

    en.wikipedia.org/wiki/Highest_averages_method

    [3]: 30 Such methods divide the number of votes by the number of votes needed to win a seat. The final apportionment. The final apportionment. In doing so, the method approximately maintains proportional representation , meaning that a party with e.g. twice as many votes will win about twice as many seats.