User:AxelBoldt

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In Amsterdam, and therefore happy.

My name is Axel Boldt and I teach mathematics at Metropolitan State University in Saint Paul, Minnesota. In addition to mathematics, I'm interested in molecular biology, theoretical computer science, physics, astronomy, free software, (political) philosophy, chess, and many other things. My home page is at math-www.uni-paderborn.de/~axel/.

Since I believe that "intellectual property rights" do not exist (as we mere mortals cannot arrogate the right to own parts of Plato's eternal heaven of ideas), every word I write is by default, and always, in the public domain.

Wikipedia:Babel
de Dieser Benutzer spricht Deutsch als Muttersprache.
en-4 This user can contribute with a near-native level of English.
fr-1 Cet utilisateur peut contribuer avec un niveau élémentaire de français.
es-1 Este usuario puede contribuir con un nivel básico de español.
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Wikipedia writings[edit]

Articles[edit]

I have contributed to and taken an active interest in the following Wikipedia articles.

Mathematics[edit]

Abelian group -- Adjacency matrix -- Adjoint functors -- Adjugate -- Algebraic geometry -- Algebraic structure -- Algebraically compact module -- Antiderivative -- Archimedian spiral -- Associative algebra -- Baire category theorem -- Banach space -- Banach-Tarski paradox -- Beatty's theorem -- Bernoulli inequality -- Binomial coefficient -- Binomial theorem -- Bolyai-Gerwien theorem -- Boolean algebra -- Boolean ring -- Borel algebra -- Braid group -- Cartesian closed category -- Catalan number -- Catalan's constant -- Category of abelian groups -- Category of sets -- Category of topological spaces -- Category theory -- Cauchy integral theorem -- Cauchy-Binet formula -- Cauchy's integral formula -- Central limit theorem -- Characteristic polynomial -- Chinese remainder theorem -- Closed set -- Closure operator -- Coalgebra -- Collatz conjecture -- Complex number -- Concrete category -- Conjugacy class -- Conjugate transpose -- Continued fraction -- Continuous Fourier transform -- Convergence of random variables -- Counting measure -- Covering map -- Cubic equation -- De Moivre's formula -- Derived functor -- Determinant -- Direct sum -- Directed set -- Dirichlet character -- Discrete Fourier transform -- Discrete logarithm -- Discrete valuation ring -- Discriminant of a polynomial -- Distribution -- Division algebra -- Division ring -- Dual space -- Ehrhart polynomial -- Ellipsoid -- Elliptic curve -- Elliptic function -- Endomorphism ring -- Entire function -- Euler's formula -- Euler's four-square identity -- Euler's identity -- Euler's theorem -- Euler-Maclaurin formula -- Even and odd permutations -- Exact functor -- Expected value -- Exponential function -- Extended Riemann hypothesis -- Extended real number line -- F-space -- Fast Fourier Transform -- Finite field -- Finitely generated abelian group -- First uncountable ordinal -- Fitting lemma -- Floor function -- Formal power series -- Four color theorem -- Fraction (mathematics) -- Fréchet space -- Free group -- Functor category -- Fundamental Theorem of Calculus -- Galois connection -- Gauss-Bonnet theorem -- Gauss-Jordan elimination -- Generalized mean -- Generalized Riemann hypothesis -- Geometric progression -- Greatest common divisor -- Grothendieck category -- Grothendieck topology -- Group action -- Group homomorphism -- Haar measure -- Hahn-Banach theorem -- Harmonic function -- Harmonic mean -- Harmonic series (mathematics) -- Hausdorff dimension -- Hilbert's basis theorem -- Hilbert's Nullstellensatz -- Hölder's inequality -- Hilbert's third problem -- Holomorphic function -- Homology (mathematics) -- Homotopy -- Hopf algebra -- Horner scheme -- Hyperbolic function -- Imaginary number -- Incircle and excircles of a triangle -- Indecomposable module -- Independent (probability) -- Initial object -- Injective module -- Inner automorphism -- Integral domain -- Invariance of domain -- Invariant subspace problem -- Invertible matrix -- Isomorphism of categories -- Jacobson radical -- Kleene algebra -- Kleene's recursion theorem -- König's lemma -- L'Hopital's rule -- Lagrange inversion theorem -- Lambert's W function -- Landau's function -- Laplace's equation -- Lebesgue measure -- Length of a module -- Lie algebra -- Lie group -- Limit (category theory) -- Limit (mathematics) -- Line integral -- Linear congruence theorem -- Linear transformation -- Liouville's theorem -- Lipschitz continuous -- List of mathematical topics -- List of small groups -- Locally compact -- Locally ringed space -- Log-normal distribution -- Logarithmic spiral -- Maximum entropy probability distribution -- Mathematical class -- Mathematics -- Matroid -- Matrix (mathematics) -- Matrix norm -- Max flow min cut theorem -- Measure of non-compactness -- Miller-Rabin primality test -- Minkowski inequality -- Minkowski's theorem -- Minor (graph theory) -- Mitchell's embedding theorem -- Modular arithmetic -- Monster group -- Monty Hall problem -- Nash embedding theorem -- Net -- Newton's method -- Nine lemma -- Normal distribution -- Normal matrix -- Normal number -- Normal space -- Nowhere dense -- Number theory -- Open map -- Open mapping theorem -- Open set -- Order (group theory) -- Order of operations -- Paracompact -- Permanent -- Pi -- Pointless topology -- Pole (complex analysis) -- Polygon -- Polynomial -- Positive definite -- Power series -- Prime ideal -- Prime number theorem -- Primitive root modulo n -- Probability density function -- Probability space -- Product (category theory) -- Product of rings -- Proportional -- Pure submodule -- Quotient ring -- Quotient space -- Rank of a matrix -- Rectifiable curve -- Reflexive space -- Regression toward the mean -- Residue (complex analysis) -- Residue theorem -- Riemannian manifold -- Riemann hypothesis -- Riemann mapping theorem -- Riemann zeta function -- Riesz representation theorem -- Ring homomorphism -- Ring ideal -- Rng -- Root of unity -- Sarkovskii's theorem -- Semi-continuous -- Semidirect product -- Shapley value -- Simple group -- Simple module -- Simply connected -- Singleton -- Slope -- Spectrum of a ring -- Stone-Weierstrass theorem -- Substitution rule -- Suslin's problem -- Symmedian -- Symmetric matrix -- Symmetry -- Tangent -- Tangent space -- Tarski's circle squaring problem -- Taylor series -- Taylor's theorem -- Tensor -- Theorem of Bolzano-Weierstrass -- Theorem of Heine-Borel -- Tietze extension theorem -- Tilting theory -- Topological group -- Topological ring -- Topos -- Trace of a matrix -- Triangle -- Tychonoff's theorem -- Uniform convergence -- Uniform space -- Uniformly continuous -- Unique factorization domain -- Universal property -- Urysohn universal space -- Urysohn's Lemma -- Vector -- Vector bundle -- Von Neumann regular ring -- Weierstrass-Casorati theorem -- Weierstrass transform -- Whitehead problem -- Yoneda lemma -- Zero divisor -- Zero morphism --

Logic and Computability[edit]

Ackermann function -- Algorithmic information theory -- Chaitin's constant -- Computable number -- Continuum hypothesis -- Definable number -- Entscheidungsproblem -- Epimenides paradox -- First-order predicate calculus -- Gödel's incompleteness theorem -- Gödel's ontological proof -- Lambda calculus -- Liar paradox -- Matiyasevich's theorem -- Ordinal -- Presburger arithmetic -- Principia Mathematica -- Word problem for groups -- Zeta function universality --

Computing[edit]

A.L.I.C.E. -- Analytical engine -- Apache Struts -- Birthday attack -- Blender (software) -- CVS -- Colossus computer -- CoolWebSearch -- Complexity classes P and NP -- Computer algebra system -- Context-free grammar -- Copyleft -- Difference engine -- Exponentiating by squaring -- F-Droid -- GIMPS -- GNU Free Documentation License -- Gnuplot -- History of computing -- ImageMagick -- JSON -- Literate programming -- MathML -- Mebibyte -- Mizar system -- Multiplication algorithm -- QED project -- Pumping lemma -- Referer spoofing -- Regular language -- Simputer -- Standards Performance Evaluation Corporation -- SWIG -- SWFTools -- Timeline of computing 1950-1979 -- Timeline of computing 1980-1989 -- Timeline of computing 1990-forward -- Timeline of computing 750 BC-1949 -- Timeline of computing -- Time hierarchy theorem -- Turing Test -- Unary -- Windows Meta File -- X video extension -- Z notation --

Physics and Astronomy[edit]

Advanced Thin Ionization Calorimeter -- Atomic mass unit -- Big Bang -- Color -- Dimensional analysis -- Grandfather paradox -- Gyrocompass -- Higgs boson -- Hubble space telescope -- Hubble's law -- Virgo Supercluster -- Physics -- Potential difference -- Prism -- Quantum mechanics -- Redshift -- Refractive index -- Schroedinger equation -- Statcoulomb -- Theory of relativity -- Uncertainty Principle -- Wave-Particle duality --

Biology[edit]

Acetaminophen -- Alcohol dehydrogenase -- Atherosclerosis -- Bacteria in the human body -- Bartholin's gland -- Bottlenose Dolphin -- Beta blocker -- Beauveria bassiana -- Blue Brain -- Blue field entoptic phenomenon -- Camellia sinensis -- Circulatory system -- Color constancy -- Common cold -- Date stone beetle -- Dendritic cell -- Discrimination abilities of pigeons -- Doublesex -- EC number -- ELISA -- Fitbone surgery -- Gray whale -- Helicobacter pylori -- HIV test -- Homologous -- Housefly -- House Mouse -- Hyperventilation -- Isotretinoin -- Human skin color -- Ketone bodies -- Knockout mouse -- Low birth weight paradox -- Malaria -- Menstrual cycle -- Myostatin -- Naloxone -- Obestatin -- Ormia ochracea -- Ontogeny and phylogeny -- Para rubber tree -- Peptide bond -- Personal Genome Project -- Phycobilin -- Plastination -- Postpartum depression -- Protein Data Bank -- Pseudomembranous colitis -- Rapid eye movement -- Recapitulation theory -- Red blood cell -- Septum -- Sir2 -- Soliton model -- Sulfate-reducing bacteria -- Timeline of evolution -- Terms for anatomical location -- Tetraploid complementation assay -- Toxoplasma gondii -- TRIM5-alpha -- UK Biobank -- Virology -- Visible Human Project --

Chemistry[edit]

Acetaldehyde -- Carbon dioxide -- CAS registry number -- Citric acid -- Ethanol -- Glucosinolate -- Glycosidic bond -- Lactic acid -- Methylcellulose -- Mustard oil -- Nitric oxide -- Nitrous oxide -- Phenacyl -- Polymethyl methacrylate -- Salt -- Sodium hypochlorite -- UN number -- Wood gas -- Zyklon B --

People[edit]

Amir Ageeb -- Mohammed Farah Aidid -- Laura María Agustín -- Alexander Alekhine -- Joan of Arc -- Mohammad Atta -- Aung_San_Suu_Kyi -- Roger Bacon -- Eric Baum -- Astrid Benöhr -- Otto von Bismarck -- Napoleon Bonaparte -- Hieronymus Bosch -- Caligula -- Gerolamo Cardano -- Elsje Christiaens -- Container Bob -- Robert Courtney -- John Craig -- Shanti Devi -- Els von Eystett -- Camelia Entekhabifard -- Robyn Few -- Linda Fairstein -- Carl Friedrich Gauss -- Ben Goertzel -- Billy Graham -- Martin Guerre -- Anara Gupta -- Gunther von Hagens -- Baby Halder -- Werner Karl Heisenberg -- Sebastian Horsley -- Harry Houdini -- Jörg Immendorff -- Sut Jhally -- Theodore Kaczynski -- Chuwit Kamolvisit -- Charles H. Keating Jr. -- Robert Kelly -- Anthony Knivet -- Maximillian Kolbe -- Tile Kolup -- Sabine Kuegler -- Donald Lang (deaf-mute) -- Liu Dalin -- Hugh Loebner -- Boris Lurie -- Johann Nepomuk Mälzel -- Ulrike Meinhof -- Claude Mellan -- Mitchell brothers -- Michel de Montaigne -- Lek Nana -- Cleo Odzer -- Erdne Ombadykow -- Pascal Pia -- Gail Palmer -- Adolphe Quetelet -- Birdie Reeve Kay -- Pornthip Rojanasunand -- Rudolph of Austria (Cardinal) -- Rainer Rupp -- Peter III of Russia -- Marquis de Sade -- Robert Shapiro -- Peter Singer -- Bernardino Cardinal Spada -- Christian Stangl -- Gertrude Stein -- Souriya Sunshine -- Ronald F. Thiemann -- Jesse Ventura -- Eduard Verhagen -- Leonardo da Vinci -- Nina de Vries -- Otto Weininger -- Stephen Wolfram -- Rob Zicari --

Miscellaneous[edit]

A Happy Death -- Amway -- Anti-prostitution pledge -- Auschwitz -- Auschwitz concentration camp -- Big Apple Oriental Tours -- Body Worlds -- Bandwagon effect -- Big Sister (brothel) -- Cavalese cable-car disaster -- Chess strategy and tactics -- Chess -- Chicken Ranch -- Cipla -- Climate changes of 535-536 -- Cognitive science of mathematics -- Daily Planet (brothel) -- Davida -- Déjà Vu (company) -- De Wallen -- Der Ackermann aus Böhmen -- dropping knowledge -- EMPOWER -- 'False positives' scandal -- Fons memorabilium universi -- Fontevraud Abbey -- Frankfurt art theft (1994) -- Hoffmann-La Roche -- Holocaust -- How to find a book -- Humanae Vitae -- Hunger artist -- Iron Mountain Mine -- Jade Record -- kaioo -- Kathoey -- Kapp Putsch -- Kern county child abuse cases -- Landmine -- Le Chabanais -- Lengede -- Likatier tribe -- Lusty Lady -- Matrix -- Memorial to the Murdered Jews of Europe -- Metropolitan State University -- Museo Soumaya -- Mustang Ranch -- Neutrality Acts of 1930s -- Nigerian money transfer fraud -- OBJECTIVE: Christian Ministries -- Ohio v. Dalton -- Operation Coffee Cup -- Paro (robot) -- Pascha (brothel) -- People v. Jovanovic -- Phar-Mor -- Philosophy of mathematics -- Platz der Republik (Berlin) -- Polygraph -- Pornography -- Potsdam Conference -- Prosecutor's fallacy -- Prostitution -- Prostitution in Germany -- Prostitution in Nevada -- Pulsed Energy Projectile -- Quixtar -- Red-eye effect -- Refugee kidnappings in Sinai -- Royal Library, Copenhagen -- Saints Innocents Cemetery -- Santorum Amendment -- Shady Lady Ranch -- Shell game -- Siddhartha -- Slogan 'AIDS Kills Fags Dead' -- Solingen arson attack of 1993 -- Snoezelen -- Spiral Island -- TAMPEP -- Tenrikyo -- The 120 Days of Sodom -- The Kreutzer Sonata -- The Myth of Sisyphus -- The Spectator Magazine -- Thumbnail gallery post -- Tiger Temple -- US Copyright Group -- Vatican Library -- WebMoney Transfer -- Whistled speech -- Wodaabe -- Wonderland Murders -- WordNet -- Yab Yum --

Wikipedia[edit]

Making fun of Britannica -- Wikipedia:How to edit a page -- Wikipedia:Searching -- Wikipedia:WikiMoney

Awards[edit]