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  2. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. 801–873 AD), who formally developed the method (the ciphers breakable by this technique go ...

  3. List of languages by total number of speakers - Wikipedia

    en.wikipedia.org/wiki/List_of_languages_by_total...

    Principal language families of the world (and in some cases geographic groups of families). For greater detail, see Distribution of languages in the world.. This is a list of languages by total number of speakers.

  4. List of radio stations in Jakarta - Wikipedia

    en.wikipedia.org/wiki/List_of_radio_stations_in...

    This is a list of online and AM/FM Jakarta radio stations, Indonesia, and their frequencies.. Call letter is shown to distinguish some radio stations from their regional counterparts (for example Radio Elshinta in Jakarta and Bandung).

  5. Frequency domain - Wikipedia

    en.wikipedia.org/wiki/Frequency_domain

    One of the main reasons for using a frequency-domain representation of a problem is to simplify the mathematical analysis. For mathematical systems governed by linear differential equations, a very important class of systems with many real-world applications, converting the description of the system from the time domain to a frequency domain converts the differential equations to algebraic ...

  6. Frequency analysis - Wikipedia

    en.wikipedia.org/wiki/Frequency_analysis

    Suppose Eve has intercepted the cryptogram below, and it is known to be encrypted using a simple substitution cipher: ...

  7. Indonesian orthography - Wikipedia

    en.wikipedia.org/wiki/Indonesian_orthography

    It restored the term "Perfected Spelling of the Indonesian Language" (Ejaan Bahasa Indonesia yang Disempurnakan). Like the previous update, it also introduced minor changes: among others, it introduced the monophthong eu [ ɘ ] , mostly used in loanwords from Acehnese and Sundanese , reaffirming the use of optional diacritics ê [ ə ] , and ...

  8. Frequency - Wikipedia

    en.wikipedia.org/wiki/Frequency

    A pendulum with a period of 2.8 s and a frequency of 0.36 Hz. For cyclical phenomena such as oscillations, waves, or for examples of simple harmonic motion, the term frequency is defined as the number of cycles or repetitions per unit of time.

  9. Indonesian language - Wikipedia

    en.wikipedia.org/wiki/Indonesian_language

    The Youth Pledge, a pledge made by Indonesian youth on October 28, 1928, defining the identity of the Indonesian nation.On the last pledge, there was an affirmation of Indonesian language as a unifying language throughout the archipelago.