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  2. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    Eliminate ambiguous or non-significant zeros by using Scientific Notation: For example, 1300 with three significant figures becomes 1.30 × 10 3. Likewise 0.0123 can be rewritten as 1.23 × 10 −2. The part of the representation that contains the significant figures (1.30 or 1.23) is known as the significand or mantissa.

  3. Mathematical software - Wikipedia

    en.wikipedia.org/wiki/Mathematical_software

    A solver is a piece of mathematical software, possibly in the form of a stand-alone computer program or as a software library, that 'solves' a mathematical problem.A solver takes problem descriptions in some sort of generic form and calculates their solution.

  4. Normalized number - Wikipedia

    en.wikipedia.org/wiki/Normalized_number

    Simply speaking, a number is normalized when it is written in the form of a × 10 n where 1 ≤ |a| < 10 without leading zeros in a. This is the standard form of scientific notation . An alternative style is to have the first non-zero digit after the decimal point.

  5. Pore pressure gradient - Wikipedia

    en.wikipedia.org/wiki/Pore_pressure_gradient

    Using the figures above, we can calculate the maximum pressure at various depths in an offshore oil well. Saltwater is 0.444 psi/ft (2.5% higher than fresh water but this not general and depends on salt concentration in water) Pore pressure in the rock could be as high as 1.0 psi/ft of depth (19.25 lb/gal)

  6. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    The notation refers to the set of the n-tuples of elements of (real coordinate space), which can be identified to the Cartesian product of n copies of . It is an n - dimensional vector space over the field of the real numbers, often called the coordinate space of dimension n ; this space may be identified to the n - dimensional Euclidean space ...

  7. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    In scientific notation, numbers are written in the form =, where is the significand and is the exponential part. Addition requires two numbers in scientific notation to be represented using the same exponential part, so that the two significands can simply be added.

  8. Tetration - Wikipedia

    en.wikipedia.org/wiki/Tetration

    Knuth's up-arrow notation (()) Allows for super-powers and super-exponential function by increasing the number of arrows; used in the article on large numbers. Text notation exp _ a ^ n(x) Based on standard notation; convenient for ASCII. J Notation x ^^: (n-1) x: Repeats the exponentiation.

  9. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Note that if n 2 is the closest perfect square to the desired square x and d = x - n 2 is their difference, it is more convenient to express this approximation in the form of mixed fraction as . Thus, in the previous example, the square root of 15 is 4 − 1 8 . {\displaystyle 4{\tfrac {-1}{8}}.}