# Josué Molina

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bio website molinajosue.blogspot.com location Houston, TX age 24 member for 2 years seen Feb 28 at 17:27 profile views 307

One Thousand Birds

 Dec2 comment How to prove that $P \neq NP$ "... then you will have effectively proved that there exists at least one $P$ such that $P=NP$..." Nov27 comment Pigeonhole Principle Homework Problem Bah! Both of you get an up-vote. Nov26 comment Area between the graph of each function and the x-axis You divided $(1)$ in four parts, but notice how some of the integrals yield negative values. Oct29 comment Trigonometry: Isosceles Triangle I see. Thank you for the link! Oct28 comment The question about the word of “Mathematics”. @JohnAdamski, I totally agree. Thank you for pointing that out. Oct28 comment The question about the word of “Mathematics”. No English word other than "mathematics" is an anagram of "mathematics." Oct28 comment Is *njwildberger* wrong about area and circumference of a circle? He must have made that term up. Oct28 comment Is *njwildberger* wrong about area and circumference of a circle? "In mathematics, a conjecture is an unproven proposition that appears correct" - en.wikipedia.org/wiki/Conjecture Oct28 comment Is *njwildberger* wrong about area and circumference of a circle? @SpongeBobSquarePants, that's a conjecture. Oct28 comment Project Euler's Problem Number 88 It sped up the program significantly, but it wasn't enough. I ended up opting for memoization, which worked. Oct23 comment Project Euler's Problem Number 88 @WillJagy I was going to ask this question at stackoverflow.com but felt it was more mathematically-inclined. I understand the problem and have theoretically solved it, but due to our current lack of computing power, I thought someone could perhaps point me toward a heuristic or a better idea. Oct15 comment Parametric function differentiation problem Why are you differentiating $y$ with respect to $x$ when it is being expressed as a function of $t$? Oct15 comment Parametric function differentiation problem Welcome! Please include what you have already tried; this is not a homework-solving machine! Oct1 comment What is wrong with this proof of: $2+2 = 5$ I see this kind of "math" as being akin to wordplay. Sep30 comment Prerequisites of general calculus Because an answer to this question would be subjective in nature, this question is unsuitable for this site. Sep30 comment If $A=\{1,2\}, B=\{1,2\}$, what is $A \cup B$? Is this kind of question allowed here? It is misleading, and its resolution lies in book definitions the author could have easily looked up. Sep26 comment How should I begin when trying to determine a proposition whose truth value is unknown? Don't think of mathematics as having some sort of rule book, but pure logic instead. Things need to make sense before you proceed! Jul23 comment The union of a sequence of countable sets is countable. I get your idea. :-) I am just trying to wrap my head around the technicalities. And thank you! Jul23 comment The union of a sequence of countable sets is countable. I was indeed trying to obtain $(1)$ but did not know how to. I am a little confused: if for $x_{k,l}$ I take $k=1$ and $l=1$, which is the first term of the sequence, then, according to your last expression, $x_{k,l}$ would be the $3$rd term? Jul23 comment The union of a sequence of countable sets is countable. @PeterTamaroff, $\mathcal S$ is an implementation of the diagonal argument.