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  2. Laws of Form - Wikipedia

    en.wikipedia.org/wiki/Laws_of_Form

    Laws of Form (hereinafter LoF) is a book by G. Spencer-Brown, published in 1969, that straddles the boundary between mathematics and philosophy. LoF describes three distinct logical systems : The primary arithmetic (described in Chapter 4 of LoF ), whose models include Boolean arithmetic ;

  3. Incompressible surface - Wikipedia

    en.wikipedia.org/wiki/Incompressible_surface

    In mathematics, an incompressible surface is a surface properly embedded in a 3-manifold, which, in intuitive terms, is a "nontrivial" surface that cannot be simplified.In non-mathematical terms, the surface of a suitcase is compressible, because we could cut the handle and shrink it into the surface.

  4. List of important publications in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_important...

    The first book on the systematic algebraic solutions of linear and quadratic equations by the Persian scholar Muhammad ibn Mūsā al-Khwārizmī. The book is considered to be the foundation of modern algebra and Islamic mathematics. [10] The word "algebra" itself is derived from the al-Jabr in the title of the book. [11]

  5. Compression (functional analysis) - Wikipedia

    en.wikipedia.org/wiki/Compression_(functional...

    If K is an invariant subspace for T, then the compression of T to K is the restricted operator K→K sending k to Tk. More generally, for a linear operator T on a Hilbert space H {\displaystyle H} and an isometry V on a subspace W {\displaystyle W} of H {\displaystyle H} , define the compression of T to W {\displaystyle W} by

  6. Siegel modular form - Wikipedia

    en.wikipedia.org/wiki/Siegel_modular_form

    The only cusp form is 0. Weight 5: The only Siegel modular form is 0. Weight 6: The space of forms of weight 6 has dimension 1 if the degree is at most 8, and dimension 0 if the degree is at least 9. The only cusp form is 0. Weight 7: The space of cusp forms vanishes if the degree is 4 or 7.

  7. Textbook - Wikipedia

    en.wikipedia.org/wiki/Textbook

    Textbooks written in Pashto distributed to Afghan school children. A textbook is a book containing a comprehensive compilation of content in a branch of study with the intention of explaining it. Textbooks are produced to meet the needs of educators, usually at educational institutions, but also of learners (who could be independent learners ...

  8. Differential form - Wikipedia

    en.wikipedia.org/wiki/Differential_form

    Differential 0-forms, 1-forms, and 2-forms are special cases of differential forms. For each k , there is a space of differential k -forms, which can be expressed in terms of the coordinates as ∑ i 1 , i 2 … i k = 1 n f i 1 i 2 … i k d x i 1 ∧ d x i 2 ∧ ⋯ ∧ d x i k {\displaystyle \sum _{i_{1},i_{2}\ldots i_{k}=1}^{n}f_{i_{1}i_{2 ...

  9. Data compression ratio - Wikipedia

    en.wikipedia.org/wiki/Data_compression_ratio

    Lossless compression of digitized data such as video, digitized film, and audio preserves all the information, but it does not generally achieve compression ratio much better than 2:1 because of the intrinsic entropy of the data. Compression algorithms which provide higher ratios either incur very large overheads or work only for specific data ...