# Paulo H.

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bio website soc.if.usp.br/~maedhros location Brazil age member for 1 year, 5 months seen May 13 at 11:33 profile views 143

I'm a undergraduate student at University of São Paulo. My favorites subjects are set-theoretical topology, logic, set theory and application to mathematical-physics.

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 Nov26 accepted What does means the $\frown$ in sequence notation? Nov26 revised What does means the $\frown$ in sequence notation?edited body Nov26 asked What does means the $\frown$ in sequence notation? Oct6 comment Directional Derivatives of $\sqrt{|xy|}$@Mykolas, for instance let $u = (1/ \sqrt{2}, 1/ \sqrt{2}) and$f(x,y) = frac{x^2 y}{x^2 + y^2}$if$(x,y)\neq (0,0)$and$f(0,0) = 0$at the origin. Oct6 comment Directional Derivatives of$\sqrt{|xy|}\$@Mykolas, that is not always true Aug16 answered What is the set operation corresponds to the last Venn diagram below? Jul4 comment Your favourite application of the Baire category theorem@CameronBuie the article is: The Baire category theorem implies the principle of dependent choices, Bull. Acad. Polon. Sci. Sér. Sci. Math. Astronom. Phys., v. 25 n. 10 (1977), pp. 933–934, by Charles Blair. But it's quite hard to find it. See more reference about it here math.stackexchange.com/questions/146910/… Jul3 comment Your favourite application of the Baire category theoremBlair's article is unique. Short and concise. This piece of mathematical work is very special for me because was the first article that I read. Jun8 awarded Constituent Jun8 awarded Caucus May30 comment Standard model of ZFC and existence of model of ZFCYou should improve your question by linking or giving the definitions of terms that aren't wide know. That'll help clarifyng the reading for those who will answer your question and for people who may use your question to get rid of their doubts. May2 revised A characterization of open setsImproving the text May2 suggested suggested edit on A characterization of open sets Apr28 accepted Rank of the commutator of linear transformations. Apr28 revised Teaching Yourself Analysisadded 208 characters in body Apr28 answered Teaching Yourself Analysis Apr19 revised Preparatory Course of A Career in Dynamical Systemsadded 1 characters in body Apr19 comment Rank of the commutator of linear transformations.@ZevChonoles It's all. Thanks. Apr19 awarded Citizen Patrol Apr19 revised Rank of the commutator of linear transformations.deleted 1118 characters in body