- Vector calculus - From Wikipedia, the free encyclopedia
Vector calculus (also called vector analysis) is a field of mathematics concerned with multivariate real analysis of vectors in two or more dimensions. It consists of a suite of formulas and problem solving techniques very useful for engineering and physics. Vector analysis has its origin in quaternion analysis, and was formulated by the American scientist, J. Willard Gibbs [1]. It concerns vector fields, which associate a vector to every point in space, and scalar fields, which associate a scalar to every point in space. For example, the temperature of a swimming pool is a scalar field: to each point we associate a scalar value of temperature. The water flow in the same pool is a vector field: to each point we associate a velocity vector.
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in Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups
Note: The summary of gradient, curl and divergence is particularly good. - MythTV - Mailing List Archive | Users
Heaps of handy stuff on SAMBA sharing and things just type search for SAMBA. User mailing list archive for MythTV. The more general mailing list archive can be found here: http://www.gossamer-threads.com/lists/mythtv/
MythTV Users
mythtv users
in Computing > HTPC
Note: The IRC channel is here: irc://irc.freenode.net/mythtv-users - One Laptop per Child
Introducing the children's laptop from One Laptop per Child—a potent learning tool created expressly for the world's poorest children living in its most remote environments. The laptop was designed collaboratively by experts from both academia and industry, bringing to bear both extraordinary talent and many decades of collective field experience in every aspect of this non-profit humanitarian project. The result is a unique harmony of form and function; a flexible, ultra low-cost, power-efficient, responsive, and durable machine with which nations of the emerging world can leapfrog decades of development—immediately transforming the content and quality of their children's learning.
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in Computing by 5 users - Songbirdnest.com
Songbird is the world's last desktop media player: it is open source, runs on Windows, Mac and Linux and supports user-contributed extensions because it is built on the same Mozilla platform as Firefox. Songbird is the world's first Web player: Songbird plays music and movies from the Web, shares playlists across the 'net, and automatically synchronizes your music to the online locker of your choice. What would you like Songbird to do?
in Computing > Software by 48 users - Design is Kinky
Design is Kinky was created by Andrew in mid 1998 in a small flat in Sydney, Australia. His main reason for starting it was simply to get involved in the design community that he saw beginning to grow online. Influenced by sites such as Digitalthread, Zeldman.com, Shift and the K10k crew, as a designer Andrew was excited at the potential that the community showed and decided to jump on board and become a part of it. So over a few sleepless nights Design is Kinky was born. At the time no one was really interviewing designers, Andrew found the few interviews he had read really interesting, so he felt that this would be a good theme to base the site on. The first Profile was on Niko Stumpo, an Italian designer who Andrew greatly admired (and still does). Niko'
in Design - Real Climate -> ClimateScience
RealClimate is a commentary site on climate science by working climate scientists for the interested public and journalists. We aim to provide a quick response to developing stories and provide the context sometimes missing in mainstream commentary. The discussion here is restricted to scientific topics and will not get involved in any political or economic implications of the science.
in Political > Enviromental by 19 users
Note: Fascinating use of Google Co-op - Bijection - wikipedia
In mathematics, a bijection, or a bijective function is a function f from a set X to a set Y with the property that, for every y in Y, there is exactly one x in X such that f(x) = y. Alternatively, f is bijective if it is a one-to-one correspondence between those sets; i.e., both one-to-one (injective) and onto (surjective).[1] (See also Bijection, injection and surjection.)
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in Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups - Bijection, injection and surjection - Wikipedia
In mathematics, injections, surjections and bijections are classes of functions distinguished by the manner in which arguments (input expressions from the domain) and images (output expressions from the codomain) are related or mapped to each other.
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in Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups
Note: Need to learn this. - Fixed point property - Wikipedia
In mathematics, a topological space X has the fixed point property if all continuous mappings from X to X have a fixed point.
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in Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups
Note: In mathematics, a fixed point (sometimes shortened to fixpoint) of a function is a point that is mapped to itself by the function... http://en.wikipedia.org/wiki/Fixed_point_%28mathematics%29 - Fixed-point theorem - Wikipedia
In mathematics, a fixed-point theorem is a result saying that a function F will have at least one fixed point (a point x for which F(x) = x), under some conditions on F that can be stated in general terms. Results of this kind are amongst the most generally useful in mathematics. The Banach fixed point theorem gives a general criterion guaranteeing that, if it is satisfied, the procedure of iterating a function yields a fixed point. By contrast, the Brouwer fixed point theorem is a non-constructive result: it says that any continuous function from the closed unit ball in n-dimensional Euclidean space to itself must have a fixed point, but it doesn't describe how to find the fixed point (See also Sperner's lemma).
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in Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups - Qunu | live help when you need it most
Qunu is a search engine for people. We use instant messaging to connect -- in real time -- people who have (for now) software or tech-related questions with experts who are passionate and willing to help.
Qunu is live help when you need it most. Qunu connects - in realtime - people who require immediate software or tech-related help with experts who are online and available to help.
in Computing > World Wide Web > Collaboration Tools by 6 users - Range (mathematics) - Wikipedia
In mathematics, the range of a function is the set of all "output" values produced by that function. Sometimes it is called the image, or more precisely, the image of the domain of the function....The range should not be confused with the codomain B. The range is a subset of the codomain, but is not necessarily equal to the codomain, since there may be elements of the codomain which are not elements of the range. The codomain is sometimes taken to be the range, but more often is some standard set, such as the real numbers or the complex numbers, which contains the range. A function whose range equals its codomain is called onto or surjective.
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in Educational > Mathematics > Ideas/Explanations/Wiki or Mathworld lookups - Ubuntu Australian Team
Welcome to the website of the Ubuntu Australian Team. The Australian Team is made up of many members from around the country, with the goal of increasing awareness (and use) of Ubuntu within Australia. For more details on the team, please visit our page on the Ubuntu wiki.
in Computing > Linux - Green Pages Australia
Great Idea, crap implementation. "Green Pages is the first national directory of environmentally sustainable products and services."
Australia is host to a vast variety of plant life. It is estimated that over 34,000 species of plants and 253,000 species of fungi and lichens make Australia their home.
in Political > Enviromental by 2 users
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