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  2. Characteristic impedance - Wikipedia

    en.wikipedia.org/wiki/Characteristic_impedance

    The characteristic impedance of an infinite transmission line at a given angular frequency is the ratio of the voltage and current of a pure sinusoidal wave of the same frequency travelling along the line. This relation is also the case for finite transmission lines until the wave reaches the end of the line. Generally, a wave is reflected back ...

  3. Strategic entry deterrence - Wikipedia

    en.wikipedia.org/wiki/Strategic_entry_deterrence

    Strategic entry deterrence. In the theories of competition in economics, strategic entry deterrence is when an existing firm within a market acts in a manner to discourage the entry of new potential firms to the market. These actions create greater barriers to entry for firms seeking entrance to the market and ensure that incumbent firms retain ...

  4. Second - Wikipedia

    en.wikipedia.org/wiki/Second

    Second. The second (symbol: s) is the unit of time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400).

  5. Visa policy of Taiwan - Wikipedia

    en.wikipedia.org/wiki/Visa_policy_of_Taiwan

    First time applicants not born in Hong Kong or Macau are also able to apply for Exit and Entry Permit online from 8 February 2017. Unlike those qualified for the no-fee Entry Permit or Entry and Exit Permit on arrival, the applicants are required to pay a processing fee of NT$600. The processing time is 5 business days.

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...

  7. Time complexity - Wikipedia

    en.wikipedia.org/wiki/Time_complexity

    Graphs of functions commonly used in the analysis of algorithms, showing the number of operations N as the result of input size n for each function. In theoretical computer science, the time complexity is the computational complexity that describes the amount of computer time it takes to run an algorithm. Time complexity is commonly estimated ...

  8. Zsigmondy's theorem - Wikipedia

    en.wikipedia.org/wiki/Zsigmondy's_theorem

    In number theory, Zsigmondy's theorem, named after Karl Zsigmondy, states that if are coprime integers, then for any integer , there is a prime number p (called a primitive prime divisor) that divides and does not divide for any positive integer , with the following exceptions: This generalizes Bang's theorem, [1] which states that if and is ...

  9. Barriers to entry - Wikipedia

    en.wikipedia.org/wiki/Barriers_to_entry

    v. t. e. In theories of competition in economics, a barrier to entry, or an economic barrier to entry, is a fixed cost that must be incurred by a new entrant, regardless of production or sales activities, into a market that incumbents do not have or have not had to incur. [1] Because barriers to entry protect incumbent firms and restrict ...

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