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2. Disk (mathematics) - Wikipedia

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

   In geometry, a disk (also spelled disc) [1] is the region in a plane bounded by a circle. A disk is said to be closed if it contains the circle that constitutes its boundary, and open if it does not. [2] For a radius, , an open disk is usually denoted as and a closed disk is ¯.

3. Positional notation - Wikipedia

   en.wikipedia.org/wiki/Positional_notation

   A digit's value is the digit multiplied by the value of its place. Place values are the number of the base raised to the nth power, where n is the number of other digits between a given digit and the radix point.

4. p-adic valuation - Wikipedia

   en.wikipedia.org/wiki/P-adic_valuation

   The p-adic valuation is a valuation and gives rise to an analogue of the usual absolute value. Whereas the completion of the rational numbers with respect to the usual absolute value results in the real numbers R {\displaystyle \mathbb {R} } , the completion of the rational numbers with respect to the p {\displaystyle p} -adic absolute value ...

5. Valuation (algebra) - Wikipedia

   en.wikipedia.org/wiki/Valuation_(algebra)

   the value group or valuation group Γ v = v(K ×), a subgroup of Γ (though v is usually surjective so that Γ v = Γ); the valuation ring R v is the set of a ∈ K with v(a) ≥ 0, the prime ideal m v is the set of a ∈ K with v(a) > 0 (it is in fact a maximal ideal of R v), the residue field k v = R v /m v,

6. Root mean square - Wikipedia

   en.wikipedia.org/wiki/Root_mean_square

   Peak values can be calculated from RMS values from the above formula, which implies V P = V RMS × √ 2, assuming the source is a pure sine wave. Thus the peak value of the mains voltage in the USA is about 120 × √ 2, or about 170 volts. The peak-to-peak voltage, being double this, is about 340 volts.

7. Unit disk - Wikipedia

   en.wikipedia.org/wiki/Unit_disk

   Unit disks are special cases of disks and unit balls; as such, they contain the interior of the unit circle and, in the case of the closed unit disk, the unit circle itself. Without further specifications, the term unit disk is used for the open unit disk about the origin, (), with respect to the standard Euclidean metric.

8. AOL Mail

   mail.aol.com/d?reason=invalid_cred

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Absolute value (algebra) - Wikipedia

   en.wikipedia.org/wiki/Absolute_value_(algebra)

   The standard absolute value on the integers. The standard absolute value on the complex numbers.; The p-adic absolute value on the rational numbers.; If R is the field of rational functions over a field F and () is a fixed irreducible polynomial over F, then the following defines an absolute value on R: for () in R define | | to be , where () = () and ((), ()) = = ((), ()).