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  2. Semisimple representation - Wikipedia

    en.wikipedia.org/wiki/Semisimple_representation

    Let V be a representation of a group G; or more generally, let V be a vector space with a set of linear endomorphisms acting on it. In general, a vector space acted on by a set of linear endomorphisms is said to be simple (or irreducible) if the only invariant subspaces for those operators are zero and the vector space itself; a semisimple representation then is a direct sum of simple ...

  3. Chern class - Wikipedia

    en.wikipedia.org/wiki/Chern_class

    In mathematics, in particular in algebraic topology, differential geometry and algebraic geometry, the Chern classes are characteristic classes associated with complex vector bundles. They have since become fundamental concepts in many branches of mathematics and physics, such as string theory , Chern–Simons theory , knot theory , and Gromov ...

  4. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    Equivalence class: given an equivalence relation, [] often denotes the equivalence class of the element x. 3. Integral part : if x is a real number , [ x ] {\displaystyle [x]} often denotes the integral part or truncation of x , that is, the integer obtained by removing all digits after the decimal mark .

  5. Cubic surface - Wikipedia

    en.wikipedia.org/wiki/Cubic_surface

    In mathematics, a cubic surface is a surface in 3-dimensional space defined by one polynomial equation of degree 3. Cubic surfaces are fundamental examples in algebraic geometry . The theory is simplified by working in projective space rather than affine space , and so cubic surfaces are generally considered in projective 3-space P 3 ...

  6. Obelus - Wikipedia

    en.wikipedia.org/wiki/Obelus

    In mathematics, the first symbol is mainly used in Anglophone countries to represent the mathematical operation of division and is called an obelus. [3] In editing texts, the second symbol, also called a dagger mark † is used to indicate erroneous or dubious content; [ 4 ] [ 5 ] or as a reference mark or footnote indicator. [ 6 ]

  7. Royal College of Art - Wikipedia

    en.wikipedia.org/wiki/Royal_College_of_Art

    The Darwin Building was designed by a team of RCA staff members, H. T. Cadbury-Brown, Hugh Casson and Robert Goodden, [12] and since 2001 has been a Grade II listed building. It is named after painter Sir Robert Vere Darwin , known as Robin Darwin, who was the rector at the time the building was commissioned.

  8. Luminosity - Wikipedia

    en.wikipedia.org/wiki/Luminosity

    The vast majority of stars are found along the main sequence with blue Class O stars found at the top left of the chart while red Class M stars fall to the bottom right. Certain stars like Deneb and Betelgeuse are found above and to the right of the main sequence, more luminous or cooler than their equivalents on the main sequence.

  9. India - Wikipedia

    en.wikipedia.org/wiki/India

    India is the habitat for 8.6% of all mammals, 13.7% of bird species, 7.9% of reptile species, 6% of amphibian species, 12.2% of fish species, and 6.0% of all flowering plant species. [ 196 ] [ 197 ] Fully a third of Indian plant species are endemic. [ 198 ]