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  2. Froebel gifts - Wikipedia

    en.wikipedia.org/wiki/Froebel_gifts

    Fröbel also developed a series of activities ("occupations") such as sewing, weaving, and modeling with clay, [1] for children to extend their experiences through play. Ottilie de Liagre [ who? ] in a letter to Fröbel in 1844 [ citation needed ] observed that playing with the Froebel gifts empowers children to be lively and free, but people ...

  3. Novikov's compact leaf theorem - Wikipedia

    en.wikipedia.org/wiki/Novikov's_compact_leaf_theorem

    The leaf is a torus T 2 bounding a solid torus with the Reeb foliation. The theorem was proved by Sergei Novikov in 1964. Earlier, Charles Ehresmann had conjectured that every smooth codimension-one foliation on S 3 had a compact leaf, which was known to be true for all known examples; in particular, the Reeb foliation has a compact leaf that ...

  4. Multifoil arch - Wikipedia

    en.wikipedia.org/wiki/Multifoil_arch

    Multifoil arch in the Aljafería, Zaragoza, Spain. A multifoil arch (or polyfoil arch), also known as a cusped arch, [1] [2] polylobed arch, [3] [4] or scalloped arch, [5] is an arch characterized by multiple circular arcs or leaf shapes (called foils, lobes, or cusps) that are cut into its interior profile or intrados.

  5. Reeb foliation - Wikipedia

    en.wikipedia.org/wiki/Reeb_foliation

    In mathematics, the Reeb foliation is a particular foliation of the 3-sphere, introduced by the French mathematician Georges Reeb (1920–1993). It is based on dividing the sphere into two solid tori , along a 2- torus : see Clifford torus .

  6. Foliation - Wikipedia

    en.wikipedia.org/wiki/Foliation

    2-dimensional section of Reeb foliation 3-dimensional model of Reeb foliation. In mathematics (differential geometry), a foliation is an equivalence relation on an n-manifold, the equivalence classes being connected, injectively immersed submanifolds, all of the same dimension p, modeled on the decomposition of the real coordinate space R n into the cosets x + R p of the standardly embedded ...

  7. Trefoil - Wikipedia

    en.wikipedia.org/wiki/Trefoil

    'Trefoil' is a term in Gothic architecture given to the ornamental foliation or cusping introduced in the heads of window-lights, tracery, and panellings, in which the centre takes the form of a three-lobed leaf (formed from three partially overlapping circles). One of the earliest examples is in the plate tracery at Winchester Cathedral (1222 ...

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