1,712 reputation
929
bio website molinajosue.blogspot.com
location Houston, TX
age 25
visits member for 2 years, 6 months
seen Aug 22 at 23:23

Oct
15
comment Parametric function differentiation problem
Why are you differentiating $y$ with respect to $x$ when it is being expressed as a function of $t$?
Oct
15
comment Parametric function differentiation problem
Welcome! Please include what you have already tried; this is not a homework-solving machine!
Oct
9
awarded  Popular Question
Oct
7
answered Find an equation of the tangent line to the curve $y=x^3-3x+1$ at the given point $(2,3)$
Oct
1
comment What is wrong with this proof of: $2+2 = 5$
I see this kind of "math" as being akin to wordplay.
Sep
30
answered Permutation vs Combination
Sep
30
answered Definite integral from $0$ to $t$ of $t$ wrt. $s$
Sep
30
comment Prerequisites of general calculus
Because an answer to this question would be subjective in nature, this question is unsuitable for this site.
Sep
30
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.
Sep
29
awarded  Popular Question
Sep
26
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!
Sep
16
awarded  Popular Question
Sep
12
revised How to integrate $\cos(\theta)\exp(i a \sin(\theta-\phi))$
The OP was fixed.
Sep
12
suggested suggested edit on How to integrate $\cos(\theta)\exp(i a \sin(\theta-\phi))$
Aug
26
asked Simple Algorithm Running Time Analysis
Jul
23
accepted The union of a sequence of countable sets is countable.
Jul
23
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!
Jul
23
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?
Jul
23
comment The union of a sequence of countable sets is countable.
@PeterTamaroff, $\mathcal S$ is an implementation of the diagonal argument.
Jul
23
asked The union of a sequence of countable sets is countable.