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  2. Field flow fractionation - Wikipedia

    en.wikipedia.org/wiki/Field_flow_fractionation

    The separation of particle bands X and Y, represented by the finite increment ∆t r in their retention times, is achieved only if the force increment ∆F between them is sufficient. A differential in force of only 10 −16 N is required for this to be the case.

  3. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    It is a slab of white marble 149 cm (59 in) in length, 75 cm (30 in) wide, and 4.5 cm (2 in) thick, on which are 5 groups of markings. In the tablet's center is a set of 5 parallel lines equally divided by a vertical line, capped with a semicircle at the intersection of the bottom-most horizontal line and the single vertical line.

  4. Pseudo-range multilateration - Wikipedia

    en.wikipedia.org/wiki/Pseudo-range_multilateration

    (For navigation, the user receiver's clock must be synchronized with the transmitter clocks; this requires that the TOT be found.) Equation 3 is the hyperboloid described in the previous section, where 4 receivers (0 ≤ m ≤ 3) lead to 3 non-linear equations in 3 unknown Cartesian coordinates (x,y,z). The system must then solve for the ...

  5. Ordinary differential equation - Wikipedia

    en.wikipedia.org/wiki/Ordinary_differential_equation

    For non-linear autonomous ODEs it is possible under some conditions to develop solutions of finite duration, [24] meaning here that from its own dynamics, the system will reach the value zero at an ending time and stays there in zero forever after. These finite-duration solutions can't be analytical functions on the whole real line, and because ...

  6. Safe and Sophie Germain primes - Wikipedia

    en.wikipedia.org/wiki/Safe_and_Sophie_Germain_primes

    Similarly, with the exception of 5, a safe prime q is of the form 4k − 1 or, equivalently, q ≡ 3 (mod 4) — trivially true since (q − 1) / 2 must evaluate to an odd natural number. Combining both forms using lcm (6, 4) we determine that a safe prime q > 7 also must be of the form 12 k − 1 or, equivalently, q ≡ 11 (mod 12).

  7. Elementary algebra - Wikipedia

    en.wikipedia.org/wiki/Elementary_algebra

    For example, taking the statement x + 1 = 0, if x is substituted with 1, this implies 1 + 1 = 2 = 0, which is false, which implies that if x + 1 = 0 then x cannot be 1. If x and y are integers, rationals, or real numbers, then xy = 0 implies x = 0 or y = 0. Consider abc = 0. Then, substituting a for x and bc for y, we learn a = 0 or bc = 0.

  8. Surya Siddhanta - Wikipedia

    en.wikipedia.org/wiki/Surya_Siddhanta

    Following the sine tables and methods of calculating the sines, Surya Siddhanta also attempts to calculate the Earth's tilt of contemporary times as described in chapter 2 and verse 28, the obliquity of the Earth's axis, the verse says "The sine of greatest declination is 1397; by this multiply any sine, and divide by radius; the arc ...