Mario De León Urbina

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699 reputation
310
bio website
location Costa Rica
age 25
visits member for 2 years, 8 months
seen Apr 17 at 16:02

I'm bachelor of Math Teaching and Economics student in the UCR. I love maths. $\sqrt { God} = love $


Apr
14
comment Prove that a sequence is a Cauchy sequence.
What happens if we have $|s_{n+1}-s_n|< \frac{1}{n}$?
Apr
14
comment If $x + \frac{1}{x} = k$, what's the value of this sum?
The initial problem is with $k=3$, but I'm thinking about consequences if $k$ is a real positive number.
Apr
14
asked If $x + \frac{1}{x} = k$, what's the value of this sum?
Mar
12
answered Exponential equation with one 'trouble' term
Feb
20
answered Proving $U_{\varepsilon}(a)\cap V_{\varepsilon}(b)=\emptyset$
Jan
29
accepted Teaching irrational numbers?
Jan
22
revised Prove $2^n\cdot n! ≤ (n+1)^n$ by induction.
[Edit removed during grace period]
Jan
22
answered Prove $2^n\cdot n! ≤ (n+1)^n$ by induction.
Jan
20
accepted Question about $f$ continuous function with these conditions?
Jan
20
answered The ratio of two numbers is $7$ to $5$. The sum of the numbers is $24$. What are the numbers?
Jan
20
asked Teaching irrational numbers?
Jan
20
answered How to factorize $2x^2+5x+3$?
Jan
16
answered Determine $\lim_{(x, y)\to (0, 0)}\frac{-x+y+1}{x^2-y^2}$
Jan
16
answered Binomial theorem for non integers ? O_o ??
Jan
16
revised Where is a flaw in these logical implications?
added 191 characters in body
Jan
16
answered Where is a flaw in these logical implications?
Jan
16
comment Where is a flaw in these logical implications?
How did you derived that $a<x$?
Jan
15
comment How do I prove a bound on the sum of volumes of disjoint rectangles in an oblique rectangle?
Maybe consult "A concise introduction to the Theory of Integration" by Daniel Stroock.
Jan
15
comment Calculate a hard limit
$x$ is a natural number?
Jan
15
asked Exponential equations solving methods?