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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. Conditional proof - Wikipedia

    en.wikipedia.org/wiki/Conditional_proof

    The validity of a conditional proof does not require that the CPA be true, only that if it were true it would lead to the consequent. Conditional proofs are of great importance in mathematics. Conditional proofs exist linking several otherwise unproven conjectures, so that a proof of one conjecture may immediately imply the validity of several ...

  4. Uniform Customs and Practice for Documentary Credits

    en.wikipedia.org/wiki/Uniform_Customs_and...

    The Uniform Customs and Practice for Documentary Credits (UCP) is a set of rules on the issuance and use of letters of credit. The UCP is utilized by bankers and commercial parties in more than 175 countries in trade finance. Some 11-15% of international trade utilizes letters of credit, totaling over a trillion dollars (US) each year.

  5. Validity (logic) - Wikipedia

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

    Many techniques are employed by logicians to represent an argument's logical form. A simple example, applied to two of the above illustrations, is the following: Let the letters 'P', 'Q', and 'S' stand, respectively, for the set of men, the set of mortals, and Socrates. Using these symbols, the first argument may be abbreviated as: All P are Q.

  6. 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.

  7. Formal verification - Wikipedia

    en.wikipedia.org/wiki/Formal_verification

    Another approach is deductive verification. [5] [6] It consists of generating from the system and its specifications (and possibly other annotations) a collection of mathematical proof obligations, the truth of which imply conformance of the system to its specification, and discharging these obligations using either proof assistants (interactive theorem provers) (such as HOL, ACL2, Isabelle ...

  8. Rhetorical modes - Wikipedia

    en.wikipedia.org/wiki/Rhetorical_modes

    The purpose of argumentation (also called persuasive writing) is to prove the validity of an idea, or point of view, by presenting sound reasoning, discussion, and argument to thoroughly convince the reader. Persuasive writing/persuasion is a type of argumentation with the additional aim to urge the reader to take some form of action.

  9. Posting rule - Wikipedia

    en.wikipedia.org/wiki/Posting_rule

    The letter of revocation can be effective only when received, that is Day 4. However, a contract was formed on Day 3 when the letter of acceptance was posted. It is too late for A to revoke the offer. Example 2: Day 1: A makes an offer to B. Day 2: B intends to reject the offer by putting a letter in the mail to A rejecting the offer.