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66 results for tags science x
  • Sage: Open Source Mathematics Software
    Sage is a free mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface. Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.
    Tue Sep 2 10:59:16 2008 - permalink -
    - http://www.sagemath.org/
    algebra algorithm CAS FOSS GPL Linux macosx mathematics programming science software statistics tool
  • Down with Determinants!
    Abstract: This paper shows how linear algebra can be done better without determinants. The standard proof that a square matrix of complex numbers has an eigenvalue uses determinants. The simpler and clearer proof presented here provides more insight and avoids determinants. Without using determinants, this allows us to define the multiplicity of an eigenvalue and to prove that the number of eigenvalues, counting multiplicities, equals the dimension of the underlying space. Without using determinants, we can define the characteristic and minimal polynomials and then prove that they behave as expected. This leads to an easy proof that every matrix is similar to a nice upper-triangular one. Turning to inner product spaces, and still without mentioning determinants, this paper gives a simple proof of the finite-dimensional spectral theorem.

    This paper was published in the American Mathematical Monthly 102 (1995), 139-154.
    In 1996 this paper received the Lester R. Ford Award for expository writing from the Mathematical Association of America.
    Fri Apr 25 19:16:28 2008 - permalink -
    - http://www.axler.net/DwD.html
    algebra mathematics science TODO
  • Andreas Müller - Schwarze Löcher - Teilchenbeschleuniger
    Good explanation of black hole physics (in german).
    Tue Feb 26 18:02:33 2008 - permalink -
    - http://www.wissenschaft-online.de/astrowissen/astro_sl_teil.html#teil
    german physics science TODO
  • Eye of Science
    Gallery of microphotographs of animate and non-animate matter.
    Mon Feb 25 16:15:33 2008 - permalink -
    - http://www.eyeofscience.com/frame1.html
    german image photo science
  • HAKMEM -- CONTENTS -- DRAFT, NOT YET PROOFED
    HTML version of the legendary Massachusetts Institute of Technology A. I. Laboratory Artificial Intelligence Memo No. 239 February 29, 1972 aka HAKMEM
    Sat Feb 2 16:15:50 2008 - permalink -
    - http://home.pipeline.com/~hbaker1/hakmem/hakmem.html
    algorithm documentation hack history HTML mathematics programming reading reference science
  • Shtetl-Optimized Blog Archive Ten Signs a Claimed Mathematical Breakthrough is Wrong
    Nice blog of a mathematician working on complexity theory. Checklist for cranks.
    Tue Jan 15 20:59:13 2008 - permalink -
    - http://scottaaronson.com/blog/?p=304
    mathematics science tool writing
  • Plot Digitizer
    Plot Digitizer is a Java program used to digitize scanned plots of functional data. Written in Java. autotracing is supported on Mac OSX, Windows and Linux. From MP.
    Tue Nov 27 15:01:01 2007 - permalink -
    - http://plotdigitizer.sourceforge.net/
    GPL Java Linux macosx plot science software Windows
  • thumbnail
    periodic table.png (PNG Image, 2084x1480 pixels)
    Periodic table of elements, as large PNG image. There is copyright on the design, although I cannot see what is so special about it. Let's be thankful that Mendeleev was more generous.
    Mon Sep 10 21:18:31 2007 - permalink -
    - http://www.dayah.com/periodic/Images/periodic%20table.png
    chemistry politics science web
  • Chronology of Milestone Events in Particle Physics
    This chronology covers period starting from Perrin and Roentgen discoveries in 1895 up to the 1995 evidence of the top quark from FNAL, and is continuously maintained up to date. Has links to many historic papers.
    Wed May 30 09:43:39 2007 - permalink -
    - http://dbserv.ihep.su/compas/index.html
    physics reading reference science TODO
  • Crackpot index
    A simple method for rating potentially revolutionary contributions to physics.
    Fri May 11 13:58:34 2007 - permalink -
    - http://math.ucr.edu/home/baez/crackpot.html
    mathematics physics science writing
  • All (known) Bodies in the Solar System Larger than 200 Miles in Diameter
    Photo collage of all largish bodies in the Solar system.
    Tue Apr 17 17:41:21 2007 - permalink -
    - http://kokogiak.com/solarsystembodieslargerthan200miles.html
    astronomy image photo physics science space
  • NGS - PRECISE GPS ORBITS COMPUTED AT THE NATIONAL GEODETIC SURVEY
    The GPS precise orbits are derived using 24 hour data segments from the global GPS network coordinated by the International GPS Service (IGS). Provides links to coordinate transformation (geoid) computations and to the continuously operating [GPS] reference stations.
    Wed Mar 28 17:32:09 2007 - permalink -
    - http://www.ngs.noaa.gov/GPS/GPS.html
    ephemeris GPS reference science
  • NGDC/STP - Ionospheric Data
    Ionosphere data for observation in the US.
    Fri Mar 23 16:01:58 2007 - permalink -
    - http://www.ngdc.noaa.gov/stp/IONO/USTEC/
    GNSS GPS physics science
  • programming musings
    Neat blog about programming, including Lisp, Smalltalk, Alan Kay's new Albert and more. The author also has a physics blog with good book tips.
    Tue Mar 13 12:13:04 2007 - permalink -
    - http://jaortega.wordpress.com/
    blog common-lisp emacs functional language lisp mathematics programming Scheme science smalltalk software squeak TODO
  • Lloyd N. Trefethen
    Nice page with numerous papers and talks about numerical analysis, including its history.
    Wed Feb 14 18:49:36 2007 - permalink -
    - http://web.comlab.ox.ac.uk/oucl/work/nick.trefethen/
    algorithm analysis mathematics matlab numerical science
  • Spektrum der Wissenschaft
    Homepage of the german version of Scientific American.
    Tue Feb 13 22:19:01 2007 - permalink -
    - http://www.spektrum.de/
    german science web writing
  • Astronomy C/C++ source code
    C/C++ version of the orbit models used with TLE data.
    Source code for astronomical calculations, including satellite orbits.
    See also https://github.com/Bill-Gray/sat_code/ which is licensed under the GPL V2.
    Thu Dec 7 19:45:53 2006 - permalink -
    - http://www.projectpluto.com/source.htm#astrocalc
    almanac astronomy C C++ GPL satellite science software
  • Structure and Interpretation of Classical Mechanics
    Tue Nov 28 20:17:48 2006 - permalink -
    - http://www-swiss.ai.mit.edu/~gjs/6946/sicm-html/index.html
    book physics programming Scheme science TODO
  • Physics News Update Number 349 - A PHOTONIC HALL EFFECT AND PHOTONIC MAGNETORESISTANCE
    Photon Hall effect works indirectly via a medium whose properties are modified by a magnetic field.
    Fri Oct 20 16:26:47 2006 - permalink -
    - http://www.aip.org/pnu/1997/split/pnu349-2.htm
    physics science
  • EURASIP Journal on Applied Signal Processing
    What the description says, makes some of its articles freely available (as PDF).
    Fri Oct 20 15:25:36 2006 - permalink -
    - http://www.hindawi.com/journals/asp/
    DSP science web writing
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