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  2. Letter of introduction - Wikipedia

    en.wikipedia.org/wiki/Letter_of_introduction

    The letter of introduction, along with the visiting card, was an important part of polite social interaction in the 18th and 19th centuries. It remains important in formal situations, such as an ambassador presenting his or her credentials (a letter of credence ), and in certain business circles.

  3. Propositional calculus - Wikipedia

    en.wikipedia.org/wiki/Propositional_calculus

    An argument is valid if, and only if, it is necessary that, if all its premises are true, its conclusion is true. [38] [41] [42] Alternatively, an argument is valid if, and only if, it is impossible for all the premises to be true while the conclusion is false. [42] [38] Validity is contrasted with soundness. [42]

  4. Letter (message) - Wikipedia

    en.wikipedia.org/wiki/Letter_(message)

    As communication technology has developed in recent history, posted letters on paper have become less important as a routine form of communication. For example, the development of the telegraph drastically shortened the time taken to send a communication, by sending it between distant points as an electrical signal. At the telegraph office ...

  5. Verification and validation - Wikipedia

    en.wikipedia.org/wiki/Verification_and_validation

    Verification is intended to check that a product, service, or system meets a set of design specifications. [6] [7] In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service, or system, then performing a review or analysis of the modeling results.

  6. Terms of reference - Wikipedia

    en.wikipedia.org/wiki/Terms_of_reference

    The terms of reference are created during the earlier stages of project management by the founders of the project in question, immediately after the approval of a project business case. They are documented by the project manager and presented to the project sponsor or sponsors for approval. Once the terms have been approved, the members of the ...

  7. Outline (list) - Wikipedia

    en.wikipedia.org/wiki/Outline_(list)

    The Outline of Knowledge was a project by Mortimer Adler. Propædia had three levels, 10 "Parts" at the top level, 41 "Divisions" at the middle level and 167 "Sections" at the bottom level, numbered, for example, "1. Matter and Energy", "1.1 Atoms", "1.1.1. Structure and Properties of Sync".

  8. Cover letter - Wikipedia

    en.wikipedia.org/wiki/Cover_letter

    Cover letters are used in connection with many business documents such as loan applications (mortgage loan), contract drafts and proposals, and executed documents. While the resume outlines the professional journey, a cover letter allows the applicant convey their personality, passion, and potential contributions to the prospective employer.

  9. Validity (logic) - Wikipedia

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

    The corresponding conditional of a valid argument is a logical truth and the negation of its corresponding conditional is a contradiction. The conclusion is a necessary consequence of its premises. An argument that is not valid is said to be "invalid". An example of a valid (and sound) argument is given by the following well-known syllogism:

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