User contributions for Marc van Leeuwen

30 August 2014

• 11:5211:52, 30 August 2014 diff hist +368 Twelvefold way →{{anchor|case fx}} Functions from N to X, up to a permutation of X: mention the relation with the Bell numbers

4 August 2014

• 13:0213:02, 4 August 2014 diff hist +910 Talk:Copy-on-write →Conflicting access
• 12:5112:51, 4 August 2014 diff hist +36 Copy-on-write →top: rewrote the lead; it had become an incoherent jumble that failed to even state what COW consists of

9 June 2014

• 11:0911:09, 9 June 2014 diff hist −48 Permutation Mostly undid revision 612129999 by Wcherowi (talk): "sequence" is perfectly correct and clear, while "ordered arrangement" is not clearly defined, and the term moreover seems a pleonasm.
• 10:3110:31, 9 June 2014 diff hist −840 Spline (mathematics) →top: Remove a paragraph of rambling prose that partially contradicts (curves) partially duplicates what is said before, makes many too vague statements, and add nothing of interest
• 10:2510:25, 9 June 2014 diff hist +61 Spline (mathematics) →top: Reformulated initial description: a polynomial function cannot be piecewise defined, but a piecewise defined function can have its pieces be polynomial functions. Also emphasise scalar-valued nature, excluding curves.

3 June 2014

• 16:2416:24, 3 June 2014 diff hist +97 Proof by contradiction →Notation: reinstate recently removed reference, now with non-retired link

2 June 2014

• 07:3807:38, 2 June 2014 diff hist −2 Talk:C++11 →Does using parentheses make something into an lvalue??
• 07:3707:37, 2 June 2014 diff hist +1,082 Talk:C++11 →Does using parentheses make something into an lvalue??: new section

19 May 2014

• 21:0721:07, 19 May 2014 diff hist −47 Weyl character formula Undid revision 609016998 by 192.16.204.74 (talk) Please ask questions (this one is understandable) on the talk page, not in the article
• 11:5111:51, 19 May 2014 diff hist +945 Division ring →Relation to fields and linear algebra: Corrected misleading stuff about ranks, and added some caveats about left and right in notation

1 May 2014

• 13:3413:34, 1 May 2014 diff hist +45 Fundamental theorem of arithmetic →top: modified footnote: "reduces to" is confusing for something that is actually a (slight) generalisation

27 April 2014

• 07:1807:18, 27 April 2014 diff hist −51 Structure theorem for finitely generated modules over a principal ideal ___domain →Invariant factor decomposition: It is the generators of the ideals that are called invariant factors, not the ideals. Also move this up a bit.

26 April 2014

• 05:4405:44, 26 April 2014 diff hist +27 m Structure theorem for finitely generated modules over a principal ideal ___domain →Invariant factor decomposition: small improvement; sentence did not read well

25 April 2014

• 12:3712:37, 25 April 2014 diff hist +544 Structure theorem for finitely generated modules over a principal ideal ___domain →Invariant factor decomposition: add a bit more explanation
• 12:2412:24, 25 April 2014 diff hist −7 Structure theorem for finitely generated modules over a principal ideal ___domain →Invariant factor decomposition: provided clearer statement

15 April 2014

• 15:1115:11, 15 April 2014 diff hist +1 m Talk:Matrix determinant lemma →Merger proposal
• 15:0515:05, 15 April 2014 diff hist +286 Talk:Matrix determinant lemma →Merger proposal: opinion
• 14:5714:57, 15 April 2014 diff hist −32 Determinant revert recent addition: the expression given was perfectly clear and sufficient in the context; adding development by first row as alternative is arbitrary and unnecessary

14 April 2014

• 07:5107:51, 14 April 2014 diff hist +14 Triangular matrix →Description: Improved presentation

13 April 2014

• 16:5716:57, 13 April 2014 diff hist +1,031 Talk:Polynomial →Merger proposal
• 16:4316:43, 13 April 2014 diff hist +10 Monomial →top: there is only one (if any) coefficient in a monomial; removed a disconcerting plural
• 11:4911:49, 13 April 2014 diff hist −1 m Inner product space remove blank line left by previous edit
• 11:4711:47, 13 April 2014 diff hist −517 Inner product space remove proof of Cauchy-Schwarz inequality. It is not very well presented, and more importantly this page is not the place to present it; the CS inequality page is.

12 April 2014

• 09:2609:26, 12 April 2014 diff hist +33 Smith normal form →Applications: algorithms don't prove theorems, so it is more proper to say the SNF serves to find invariant factors than to prove the structure theorem

8 April 2014

• 10:5710:57, 8 April 2014 diff hist −3 Polynomial →top: "variables, called indeterminates" -> "variables (or indeterminates)": don't imply the notions are the same, but don't make a fuss about the distinction here either

21 March 2014

• 17:0117:01, 21 March 2014 diff hist −516 Principal value →Exponential function: Removing the section: each exponential function is single-valued on the complex numbers; deciding *which* exponential function to use is not choosing a principal value

9 March 2014

• 13:0613:06, 9 March 2014 diff hist +4 m Cayley–Hamilton theorem →Preliminaries: add "any" to avoid possible confusion
• 13:0313:03, 9 March 2014 diff hist −1 m Talk:Cayley–Hamilton theorem →Claim about sufficient condition for a matrix to be diagonal is false as stated.
• 13:0213:02, 9 March 2014 diff hist +650 Talk:Cayley–Hamilton theorem →Claim about sufficient condition for a matrix to be diagonal is false as stated.
• 12:4512:45, 9 March 2014 diff hist +1,381 Talk:Special linear group →Transvections don't always generate the special linear group?: new section

5 March 2014

• 06:1206:12, 5 March 2014 diff hist +178 Vandermonde matrix →Properties: Added restriction to square matrices where it was obviously necessary

23 February 2014

• 12:2412:24, 23 February 2014 diff hist +285 Nimber →Multiplication: clarified, and replaced a requestion for citation by a simple explanation

5 February 2014

• 14:5914:59, 5 February 2014 diff hist +142 Talk:Infinity →Minus one twelfth

4 February 2014

• 16:0216:02, 4 February 2014 diff hist −466 Natural number Undid revision 593890515 by Drbogdan (talk) Placing this "fact" in the lead, without any context that distinguishes if from the obvious falsehood it is on when taken on face value, is not OK

31 December 2013

• 11:1811:18, 31 December 2013 diff hist +36 Frobenius normal form Disambiguated: minimal polynomial → minimal polynomial (linear algebra)

30 December 2013

• 17:5417:54, 30 December 2013 diff hist +625 Frobenius normal form →Example: replace section by a better example
• 08:2808:28, 30 December 2013 diff hist −11 Frobenius normal form →Motivating example: Remove "Motivating". This example is actually demotivating; the section needs rewriting
• 08:2608:26, 30 December 2013 diff hist +4,366 Frobenius normal form →Motivation: Add section

19 December 2013

• 09:3609:36, 19 December 2013 diff hist +28 Cayley–Hamilton theorem Rephrase slightly
• 09:2509:25, 19 December 2013 diff hist −75 Cayley–Hamilton theorem Undid revision 586680669 by Cuzkatzimhut (talk) Linear dependence of n+1 vectors is not the same as (but weaker than) that the last vector is a linear combination of the n preceding ones.
• 09:2009:20, 19 December 2013 diff hist +20 m Integrally closed ___domain repair English

15 December 2013

• 07:1007:10, 15 December 2013 diff hist +1,325 Elementary divisors Describe relation to invariant factors
• 06:3806:38, 15 December 2013 diff hist +69 Associatedness redefine redirect: this should redirect to the same thing as "associated element" does
• 06:3106:31, 15 December 2013 diff hist +23 Invariant factor clarify phrase (by replacing the horrendous Z^+_0 notation)
• 06:2606:26, 15 December 2013 diff hist −116 Elementary divisors Now remove stuff that belongs to invariant factors (only)

13 December 2013

• 19:5219:52, 13 December 2013 diff hist +49 Elementary divisors reverting my earlier edit; it seems I resolved in the wrong direction

12 December 2013

• 12:3012:30, 12 December 2013 diff hist +118 Elementary divisors stress that sum is finite

10 December 2013

• 09:0409:04, 10 December 2013 diff hist +55 Polynomial →Definition: clarify sentence; arithmetic operations themselves cannot be performed on x (e.g., 2x just stays 2x)

9 December 2013

• 10:4310:43, 9 December 2013 diff hist +79 m Matrix similarity →Properties: oops, geometric multiplicities are not determined by the characteristic polynomial