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The Knot Worldwide, formerly XO Group, The Knot Inc, and WeddingWire, Inc, is a global technology company that provides content, tools, products and services for couples who are planning weddings, organizing a celebration, and navigating pregnancy and parenting. In 2019, The Knot Worldwide was created by a merger between predecessors XO Group ...
Unknotting number. Trefoil knot without 3-fold symmetry being unknotted by one crossing switch. In the mathematical area of knot theory, the unknotting number of a knot is the minimum number of times the knot must be passed through itself ( crossing switch) to untie it. If a knot has unknotting number , then there exists a diagram of the knot ...
All calls inside Estonia are local; trunk codes are not used. [1] Landline phone numbers have 7 digits, mobile numbers can have either 7 or 8 digits, machine-to-machine (M2M) numbers can be up to 12 digits. [2] Telephone numbers are portable between locations and operators. The country code for Estonia is +372. [3]
Bridge number was first studied in the 1950s by Horst Schubert. [2] [3] The bridge number can equivalently be defined geometrically instead of topologically . In bridge representation, a knot lies entirely in the plane apart for a finite number of bridges whose projections onto the plane are straight lines. Equivalently the bridge number is the ...
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376 – Andorra (formerly 33 628) 377 – Monaco (formerly 33 93) 378 – San Marino (interchangeably with 39 0549; earlier was allocated 295 but never used) 379 – Vatican City (assigned but uses 39 06698). 38 – formerly assigned to Yugoslavia until its break-up in 1991. 380 – Ukraine. 381 – Serbia.
A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced ...
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