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  2. List of common coordinate transformations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_coordinate...

    Note: solving for ′ returns the resultant angle in the first quadrant (< <). To find , one must refer to the original Cartesian coordinate, determine the quadrant in which lies (for example, (3,−3) [Cartesian] lies in QIV), then use the following to solve for :

  3. Programming with Big Data in R - Wikipedia

    en.wikipedia.org/wiki/Programming_with_Big_Data_in_R

    Programming with Big Data in R (pbdR) [1] is a series of R packages and an environment for statistical computing with big data by using high-performance statistical computation. [ 2 ] [ 3 ] The pbdR uses the same programming language as R with S3/S4 classes and methods which is used among statisticians and data miners for developing statistical ...

  4. Biharmonic equation - Wikipedia

    en.wikipedia.org/wiki/Biharmonic_equation

    In two-dimensional polar coordinates, the biharmonic equation is ((())) + + + = which can be solved by separation of variables. The result is the Michell solution . 2-dimensional space

  5. Polar set - Wikipedia

    en.wikipedia.org/wiki/Polar_set

    The real polar of a subset of is the set: := { : ⁡ , } and the real prepolar of a subset of is the set: := { : ⁡ , }.. As with the absolute prepolar, the real prepolar is usually called the real polar and is also denoted by . [2] It's important to note that some authors (e.g. [Schaefer 1999]) define "polar" to mean "real polar" (rather than "absolute polar", as is done in this article) and ...

  6. Two-center bipolar coordinates - Wikipedia

    en.wikipedia.org/wiki/Two-center_bipolar_coordinates

    In mathematics, two-center bipolar coordinates is a coordinate system based on two coordinates which give distances from two fixed centers and . [1] This system is very useful in some scientific applications (e.g. calculating the electric field of a dipole on a plane).

  7. Who did President Biden pardon? See the full list of names ...

    www.aol.com/did-president-biden-pardon-see...

    President Joe Biden is commuting the sentences of nearly 1,500 people and pardoning 39 others in "the largest single-day act of clemency in modern history," the White House announced Thursday. The ...

  8. Polar topology - Wikipedia

    en.wikipedia.org/wiki/Polar_topology

    A pairing is a triple (,,) consisting of two vector spaces over a field (either the real numbers or complex numbers) and a bilinear map:. A dual pair or dual system is a pairing ( X , Y , b ) {\displaystyle (X,Y,b)} satisfying the following two separation axioms:

  9. 5 Little Luxuries To Buy That’ll Help You With Your 2025 ...

    www.aol.com/5-little-luxuries-buy-ll-220016048.html

    The 20 best sales this weekend: Candy for stockings, wool sweaters, kid's PJs and more