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  2. Porphyrian tree - Wikipedia

    en.wikipedia.org/wiki/Porphyrian_tree

    Porphyrian trees by three authors: Purchotius (1730), Boethius (6th century), and Ramon Llull (ca. 1305). In philosophy (particularly the theory of categories), the Porphyrian tree or Tree of Porphyry is a classic device for illustrating a "scale of being" (Latin: scala praedicamentalis), attributed to the 3rd-century CE Greek neoplatonist philosopher and logician Porphyry, and revived through ...

  3. Tree (graph theory) - Wikipedia

    en.wikipedia.org/wiki/Tree_(graph_theory)

    In graph theory, a tree is an undirected graph in which any two vertices are connected by exactly one path, or equivalently a connected acyclic undirected graph. [1] A forest is an undirected graph in which any two vertices are connected by at most one path, or equivalently an acyclic undirected graph, or equivalently a disjoint union of trees.

  4. Sic et Non - Wikipedia

    en.wikipedia.org/wiki/Sic_et_Non

    Sic et Non, an early scholastic text whose title translates from Medieval Latin as "Yes and No", was written by Peter Abelard.In the work, Abelard juxtaposes apparently contradictory quotations from the Church Fathers on many of the traditional topics of Christian theology.

  5. Self-reference puzzle - Wikipedia

    en.wikipedia.org/wiki/Self-reference_puzzle

    A self-reference puzzle is a type of logical puzzle where the question in the puzzle refers to the attributes of the puzzle itself. [1] A common example is that a "fill in the blanks" style sentence is given, but what is filled in the blanks can contribute to the sentence itself.

  6. Cross-figure - Wikipedia

    en.wikipedia.org/wiki/Cross-figure

    Example grid for a cross-figure puzzle with some answers filled in. A cross-figure (also variously called cross number puzzle or figure logic) is a puzzle similar to a crossword in structure, but with entries that consist of numbers rather than words, where individual digits are entered in the blank cells.

  7. Monadic second-order logic - Wikipedia

    en.wikipedia.org/wiki/Monadic_second-order_logic

    In mathematical logic, monadic second-order logic (MSO) is the fragment of second-order logic where the second-order quantification is limited to quantification over sets. [1] It is particularly important in the logic of graphs , because of Courcelle's theorem , which provides algorithms for evaluating monadic second-order formulas over graphs ...

  8. List of Cyberchase episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Cyberchase_episodes

    The Cybrary is under attack again, and the kids have to use logic and elimination processes to stop Hacker from entering Motherboard's vault. For Real: "Bianca Gets a Clue" When the sacred cup of Cameroon goes missing, Bianca tries to figure out who stole it.

  9. Gokigen Naname - Wikipedia

    en.wikipedia.org/wiki/Gokigen_Naname

    Gokigen Naname is played on a rectangular grid in which numbers in circles appear at some of the intersections on the grid.. The object is to draw diagonal lines in each cell of the grid, such that the number in each circle equals the number of lines extending from that circle.