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  2. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  3. Secret Mall Apartment - Wikipedia

    en.wikipedia.org/wiki/Secret_Mall_Apartment

    Secret Mall Apartment is an American documentary film directed by filmmaker Jeremy Workman that recounts the story of a group of young Rhode Islanders who built a secret apartment inside the bustling Providence Place shopping mall in Providence, Rhode Island in 2003, living there for four years until getting caught and charged with trespassing in 2007.

  4. 306 (number) - Wikipedia

    en.wikipedia.org/wiki/306_(number)

    306 is an even composite number with three prime factors. [1] 306 is the sum of consecutive primes 71+73+79+83. 306 is the 17th oblong number meaning that it is equal to 17*18. [2] [3] 306 is an untouchable number meaning that it is unable to be equal to the sum of proper factors in any number. [4] [5] There are 306 triangular numbers with 5 ...

  5. Extraneous and missing solutions - Wikipedia

    en.wikipedia.org/wiki/Extraneous_and_missing...

    The solution = is in fact a valid solution to the original equation; but the other solution, =, has disappeared. The problem is that we divided both sides by x {\displaystyle x} , which involves the indeterminate operation of dividing by zero when x = 0. {\displaystyle x=0.}

  6. Equation solving - Wikipedia

    en.wikipedia.org/wiki/Equation_solving

    The solution set of the equation ⁠ x 2 / 4 ⁠ + y 2 = 1 forms an ellipse when interpreted as a set of Cartesian coordinate pairs. Main article: Solution set The solution set of a given set of equations or inequalities is the set of all its solutions, a solution being a tuple of values, one for each unknown , that satisfies all the equations ...

  7. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    For example, when d=4, the hash table for two occurrences of d would contain the key-value pair 8 and 4+4, and the one for three occurrences, the key-value pair 2 and (4+4)/4 (strings shown in bold). The task is then reduced to recursively computing these hash tables for increasing n , starting from n=1 and continuing up to e.g. n=4.

  8. Battle of Salamis (306 BC) - Wikipedia

    en.wikipedia.org/wiki/Battle_of_Salamis_(306_BC)

    [12] [19] As the historian Richard Billows writes, "the battle was in effect a race to see which of the two dynasts could first defeat the enemy's right wing and turn to attack the enemy's center", with the "added question of whether or not Menelaus would succeed in breaking out of Salamis in time to intervene". [20]

  9. Answers.com - Wikipedia

    en.wikipedia.org/wiki/Answers.com

    On October 17, 2005, GuruNet changed its corporate name to Answers Corporation, unifying the company's name and its website, Answers.com. [4] From 2005 to late 2009, the Google search engine definitions feature, in the top-right corner of the site, was linked to Answers.com. [5] On July 2, 2006, Answers.com released a trivia game known as blufr.