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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. Logical form - Wikipedia

    en.wikipedia.org/wiki/Logical_Form

    In logic, the logical form of a statement is a precisely-specified semantic version of that statement in a formal system.Informally, the logical form attempts to formalize a possibly ambiguous statement into a statement with a precise, unambiguous logical interpretation with respect to a formal system.

  4. 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.

  5. Wikipedia:WikiProject Schools/Article advice - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:WikiProject...

    Use wiki-links wisely; check that the content applies in the education system you are describing. For example, the letter K in the British school system is an abbreviation for Key Stage, but in the US is an abbreviation for kindergarten. Kindergarten is a pre-school in most European countries but part of the school system in North America.

  6. Proof by contradiction - Wikipedia

    en.wikipedia.org/wiki/Proof_by_contradiction

    In logic, proof by contradiction is a form of proof that establishes the truth or the validity of a proposition by showing that assuming the proposition to be false leads to a contradiction. Although it is quite freely used in mathematical proofs, not every school of mathematical thought accepts this kind of nonconstructive proof as universally ...

  7. 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]

  8. 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:

  9. 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.