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  2. Quantization of the electromagnetic field - Wikipedia

    en.wikipedia.org/wiki/Quantization_of_the...

    By doing this, the expanded field is converted into a fermion or boson operator field. The expansion coefficients have been promoted from ordinary numbers to operators, creation and annihilation operators. A creation operator creates a particle in the corresponding basis function and an annihilation operator annihilates a particle in this function.

  3. Telephone numbers in Cambodia - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Cambodia

    To dial a land line in Cambodia all over the country, the format is Area Code + Phone Number. The area code is 3 digits long, followed by a 6 or 7 digit phone number. Calls made from outside Cambodia must omit the prefix 0. Therefore, to call a land line number in Phnom Penh from other countries, dialing begins with +855 23 followed by 6 or 7 ...

  4. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    The use of alphanumeric codes for area codes was abandoned in Europe when international direct dialing was introduced in the 1960s, because, for example, dialing VIC 8900 on a Danish telephone would result in a different number to dialling it on a British telephone. At the same time, letters were no longer placed on the dials/keypads of new ...

  5. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    "xxx" denotes the area code. All area codes begin with the number 0. The operator code for fixed (landline) numbers is "y". "zzzzzz" denotes the primary telephone number, which has six digits. Mobile numbers start with the mobile operator code (which begins from 07X, followed by seven digits for the main telephone number). Format: (XXX ZZZZZZZ ...

  6. List of mobile network operators in Canada - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_network...

    As of March 2021, there are over 33 million wireless subscriptions in Canada. [1] Approximately 90% of Canadian mobile phone users subscribe to one of the four largest national telecommunication companies (Rogers Wireless, Bell Mobility, Freedom Mobile and Telus Mobility) or one of their subsidiary brands.

  7. Zabasearch.com - Wikipedia

    en.wikipedia.org/wiki/Zabasearch.com

    Zabasearch.com is a website that searches for and collates disparate information regarding United States residents, including names, current and past addresses, phone numbers, and birth years, and then permits the user to query other search engines with this information to retrieve additional data, such as satellite photos of addresses and criminal background checks.

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