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  2. Mathematical notation - Wikipedia

    en.wikipedia.org/wiki/Mathematical_notation

    Mathematical notation consists of using symbols for representing operations, unspecified numbers, relations, and any other mathematical objects and assembling them into expressions and formulas. Mathematical notation is widely used in mathematics, science, and engineering for representing complex concepts and properties in a concise ...

  3. Simple past - Wikipedia

    en.wikipedia.org/wiki/Simple_past

    The simple past, past simple, or past indefinite, in English equivalent to the preterite, is the basic form of the past tense in Modern English. It is used principally to describe events in the past, although it also has some other uses. [ 1] Regular English verbs form the simple past in -ed; however, there are a few hundred irregular verbs ...

  4. Curl (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Curl_(mathematics)

    v. t. e. In vector calculus, the curl, also known as rotor, is a vector operator that describes the infinitesimal circulation of a vector field in three-dimensional Euclidean space. The curl at a point in the field is represented by a vector whose length and direction denote the magnitude and axis of the maximum circulation. [ 1]

  5. Grammatical tense - Wikipedia

    en.wikipedia.org/wiki/Grammatical_tense

    Grammatical tense. In grammar, tense is a category that expresses time reference. [ 1][ 2] Tenses are usually manifested by the use of specific forms of verbs, particularly in their conjugation patterns. The main tenses found in many languages include the past, present, and future. Some languages have only two distinct tenses, such as past and ...

  6. Summation - Wikipedia

    en.wikipedia.org/wiki/Summation

    t. e. In mathematics, summation is the addition of a sequence of numbers, called addends or summands; the result is their sum or total. Beside numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any type of mathematical objects on which an operation denoted "+" is defined.

  7. How much should a house down payment be? - AOL

    www.aol.com/finance/much-house-down-payment...

    Here's how those numbers have changed over the past few years, per the report: Year. Average down payment percentage of home value. Median down payment amount. Q1 2024. 13.6%. $26,400. Q1 2023. 13%.

  8. Sequence of tenses - Wikipedia

    en.wikipedia.org/wiki/Sequence_of_tenses

    In Latin, the sequence of tenses rule affects dependent verbs in the subjunctive mood, mainly in indirect questions, indirect commands, and purpose clauses. If the main verb is in one of the non-past tenses, the subordinate verb is usually in the present or perfect subjunctive (primary sequence); if the main verb is in one of the past tenses, the subordinate verb is usually in the imperfect or ...

  9. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    v. t. e. Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function. Euler's formula states that, for any real number x, one has where e is the base of the natural logarithm, i is the imaginary ...