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13h

reviewed  Close solve for three unknowns. 
20h

reviewed  Close Topology : Study on Separation Properties 
20h

reviewed  Reviewed How to find an integer set, s.t. the sums of at most 3 elements are all distinct? 
20h

reviewed  Reviewed Cusp points in Alexandrov spaces 
22h

reviewed  Close Cardinality of $C^*([0,1])$ 
22h

reviewed  Close Basis for the rational functions 
1d

reviewed  Leave Open Is this divisor ample on the product of two curves 
2d

reviewed  Approve suggested edit on limiting empirical spectral distribution of the Laplacian matrix on an ErdosRenyi graph? 
2d

reviewed  Close Di PernaLions theory for transport equation 
2d

reviewed  Close Theorems true but wrong. 
Jul 19 
reviewed  Leave Closed What does ! above = mean 
Jul 19 
reviewed  Reviewed Is there a mistake in Vapnik's “Basic Lemma”? 
Jul 19 
comment 
Associated prime ideals and local cohomology
Welcome to the site! Title means title of the question, not you personal title. You can change this via using "edit" below the question. 
Jul 19 
comment 
Negative impact of wrong or nonrigorous proofs
For a discussion of mistakes of the "Italian" geometers see mathoverflow.net/questions/19420/… 
Jul 19 
comment 
Negative impact of wrong or nonrigorous proofs
Thanks for the reply. In my opinion it is still a considerable stretch to post this as answer (a shorter version could be a comment). The point of the question is not Newton's approach to calculus, and it got merely metioned as OP thought (perhaps wrongly) there were examples of what they asked about (wrong and nonrigorous proofs) to be found there. 
Jul 19 
comment 
Negative impact of wrong or nonrigorous proofs
How does this answer the question? 
Jul 19 
reviewed  Reviewed Open problems in Federer's Geometric Measure Theory 
Jul 19 
comment 
Open problems in Federer's Geometric Measure Theory
Welcome to the site! It could help attract more interest to the question if it were possible to understand it without having the book handy. Perhaps you could reproduce the things you ask about here. You can expand the question by clicking "edit" just below it. 
Jul 19 
comment 
Should all equations which appear in a thesis be numbered?
@Neil and Igor Khavkine: it is no longer (since the switch to MO 2.0) possible for users to make questions Community Wiki irrespective of reputation. The way to approach this is to "flag" (button below question) reason "other" and ask for it. [It is done already for this question, this is just for completeness.] 
Jul 18 
reviewed  Leave Open Refutation of $A \land \lnot\lnot\lnot A$ by resolution 