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  2. Data conversion - Wikipedia

    en.wikipedia.org/wiki/Data_conversion

    As another example, converting from PDF to an editable word processor format is a tough chore, because PDF records the textual information like engraving on stone, with each character given a fixed position and linebreaks hard-coded, whereas word processor formats accommodate text reflow. PDF does not know of a word space character—the space ...

  3. Term (logic) - Wikipedia

    en.wikipedia.org/wiki/Term_(logic)

    For example, at position 122 of the black term in the picture, the subterm a+2 has its root. The relation "is a subterm of" is a partial order on the set of terms; it is reflexive since each term is trivially a subterm of itself. The term obtained by replacing in a term t the subterm at a position p by a new term u is commonly denoted by t[u] p.

  4. Euler–Rodrigues formula - Wikipedia

    en.wikipedia.org/wiki/Euler–Rodrigues_formula

    In mathematics and mechanics, the Euler–Rodrigues formula describes the rotation of a vector in three dimensions. It is based on Rodrigues' rotation formula , but uses a different parametrization. The rotation is described by four Euler parameters due to Leonhard Euler .

  5. ROT13 - Wikipedia

    en.wikipedia.org/wiki/ROT13

    Some words will, when transformed with ROT13, produce another word. Examples of 7-letter pairs in the English language are abjurer and nowhere, and Chechen and purpura. Other examples of words like these are shown in the table. [12] The pair gnat and tang is an example of words that are both ROT13 reciprocals and reversals.

  6. First-order logic - Wikipedia

    en.wikipedia.org/wiki/First-order_logic

    For example, one common rule of inference is the rule of substitution. If t is a term and φ is a formula possibly containing the variable x, then φ[t/x] is the result of replacing all free instances of x by t in φ. The substitution rule states that for any φ and any term t, one can conclude φ[t/x] from φ provided that no free variable of ...

  7. Document-term matrix - Wikipedia

    en.wikipedia.org/wiki/Document-term_matrix

    Note that, unlike representing a document as just a token-count list, the document-term matrix includes all terms in the corpus (i.e. the corpus vocabulary), which is why there are zero-counts for terms in the corpus which do not also occur in a specific document. For this reason, document-term matrices are usually stored in a sparse matrix format.

  8. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Rotation formalisms in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotation_formalisms_in...

    This is Rodrigues' formula for the axis of a composite rotation defined in terms of the axes of the two component rotations. He derived this formula in 1840 (see page 408). [3] The three rotation axes A, B, and C form a spherical triangle and the dihedral angles between the planes formed by the sides of this triangle are defined by the rotation ...