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  2. Algebraic closure - Wikipedia

    en.wikipedia.org/wiki/Algebraic_closure

    In mathematics, particularly abstract algebra, an algebraic closure of a field K is an algebraic extension of K that is algebraically closed.It is one of many closures in mathematics.

  3. Cramer's rule - Wikipedia

    en.wikipedia.org/wiki/Cramer's_rule

    In linear algebra, Cramer's rule is an explicit formula for the solution of a system of linear equations with as many equations as unknowns, valid whenever the system has a unique solution.

  4. Belum Caves - Wikipedia

    en.wikipedia.org/wiki/Belum_Caves

    The Belum Caves, located in Nandyala district of Andhra Pradesh's Rayalaseema region, is the second largest cave system on the Indian subcontinent, known for its speleothems, such as stalactite and stalagmite formations. The Belum Caves have long passages, galleries, spacious caverns with fresh water and siphons.