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  2. Outer space (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Outer_space_(mathematics)

    Up to a (free) homotopy, f is uniquely determined by the isomorphism f # : π 1 (R n) → π 1 (Γ), that is by an isomorphism F n → π 1 (Γ). A metric graph is a finite connected graph γ {\displaystyle \gamma } together with the assignment to every topological edge e of Γ of a positive real number L ( e ) called the length of e .

  3. Dodecagon - Wikipedia

    en.wikipedia.org/wiki/Dodecagon

    A dodecagram is a 12-sided star polygon, represented by symbol {12/n}. There is one regular star polygon : {12/5}, using the same vertices, but connecting every fifth point. There are also three compounds: {12/2} is reduced to 2{6} as two hexagons , and {12/3} is reduced to 3{4} as three squares , {12/4} is reduced to 4{3} as four triangles ...

  4. Graph paper - Wikipedia

    en.wikipedia.org/wiki/Graph_paper

    Graph paper, coordinate paper, grid paper, or squared paper is writing paper that is printed with fine lines making up a regular grid. It is available either as loose leaf paper or bound in notebooks or Graph Books. It is commonly found in mathematics and engineering education settings, exercise books, and in laboratory notebooks.

  5. List of two-dimensional geometric shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_two-dimensional...

    Download QR code; Print/export Download as PDF; Printable version; In other projects Wikidata item; ... Dodecagon – 12 sides; Tridecagon – 13 sides;

  6. Net (polyhedron) - Wikipedia

    en.wikipedia.org/wiki/Net_(polyhedron)

    In geometry, a net of a polyhedron is an arrangement of non-overlapping edge-joined polygons in the plane which can be folded (along edges) to become the faces of the polyhedron. Polyhedral nets are a useful aid to the study of polyhedra and solid geometry in general, as they allow for physical models of polyhedra to be constructed from ...

  7. Geometric Exercises in Paper Folding - Wikipedia

    en.wikipedia.org/wiki/Geometric_Exercises_in...

    Geometric Exercises in Paper Folding is a book on the mathematics of paper folding. It was written by Indian mathematician T. Sundara Row, first published in India in 1893, and later republished in many other editions. Its topics include paper constructions for regular polygons, symmetry, and algebraic curves. According to the historian of ...

  8. Polygonal number - Wikipedia

    en.wikipedia.org/wiki/Polygonal_number

    In mathematics, a polygonal number is a number that counts dots arranged in the shape of a regular polygon [1]: 2-3 . These are one type of 2-dimensional figurate numbers . Polygonal numbers were first studied during the 6th century BC by the Ancient Greeks, who investigated and discussed properties of oblong , triangular , and square numbers ...

  9. OpenStax - Wikipedia

    en.wikipedia.org/wiki/Openstax

    OpenStax textbooks follow a traditional peer review process aimed at ensuring they meet a high quality standard before publication. Textbooks are developed and peer-reviewed by educators in an attempt to ensure they are readable and accurate, meet the scope and sequence requirements of each course, are supported by instructor ancillaries, and are available with the latest technology-based ...