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  2. Principal ideal - Wikipedia

    en.wikipedia.org/wiki/Principal_ideal

    Principal ideal. In mathematics, specifically ring theory, a principal ideal is an ideal in a ring that is generated by a single element of through multiplication by every element of The term also has another, similar meaning in order theory, where it refers to an (order) ideal in a poset generated by a single element which is to say the set of ...

  3. Argument (complex analysis) - Wikipedia

    en.wikipedia.org/wiki/Argument_(complex_analysis)

    Figure 1. This Argand diagram represents the complex number lying on a plane.For each point on the plane, arg is the function which returns the angle . In mathematics (particularly in complex analysis), the argument of a complex number z, denoted arg(z), is the angle between the positive real axis and the line joining the origin and z, represented as a point in the complex plane, shown as in ...

  4. Principal Holy Day (Anglicanism) - Wikipedia

    en.wikipedia.org/wiki/Principal_Holy_Day...

    Principal Holy Day (Anglicanism) Principal Holy Days are a type of observance in the Anglican Communion, including the Church of England. All Principal Feasts are also Principal Holy Days. All Principal Holy Days share equal status; however those which are not Principal Feasts, being fast days within the season of Lent, lack a festal character.

  5. Pinch valve - Wikipedia

    en.wikipedia.org/wiki/Pinch_valve

    Operating principle. Pinch valves employ an elastic tubing (sleeve/hose) and a device that directly contacts the tubing (body). Forcing the tubing together will create a seal that is equivalent to the tubing's permeability.

  6. Outlook.com - Wikipedia

    en.wikipedia.org/wiki/Outlook.com

    Outlook.com, formerly Hotmail, is a free personal email service offered by Microsoft. This includes a webmail interface featuring mail, calendaring, contacts, and tasks services. Outlook can also be accessed via email clients using the IMAP or POP protocols. Founded in 1996 by Sabeer Bhatia and Jack Smith as Hotmail, it was acquired by ...

  7. Instagram - Wikipedia

    en.wikipedia.org/wiki/Instagram

    t. e. Instagram [a] is a photo and video sharing social networking service owned by Meta Platforms. It allows users to upload media that can be edited with filters, be organized by hashtags, and be associated with a location via geographical tagging. Posts can be shared publicly or with preapproved followers.

  8. Principal axis theorem - Wikipedia

    en.wikipedia.org/wiki/Principal_axis_theorem

    Mathematically, the principal axis theorem is a generalization of the method of completing the square from elementary algebra. In linear algebra and functional analysis, the principal axis theorem is a geometrical counterpart of the spectral theorem. It has applications to the statistics of principal components analysis and the singular value ...

  9. Vice-principal - Wikipedia

    en.wikipedia.org/wiki/Vice-principal

    Vice-principal. In larger school systems, a head teacher principal is often assisted by someone known as a vice-principal, deputy principal, or assistant/associate principal. Unlike the principal, the vice-principal does not have quite the decision-making authority that the principal carries. Although they still carry nearly the same authority ...