mousomer
Reputation
321
Next privilege 500 Rep.
Access review queues
 Feb24 answered Topology: Continuous Functions Feb23 answered Dirac's delta, infinite series and integral Feb23 comment Dirac's delta, infinite series and integral Tryss, Dirac is a linear integral operator on the space of functions. It is defined as an object which gives you $\int f(x) \delta (x-x_0)dx = f(x_0)$. Feb22 comment Dirac's delta, infinite series and integral Is $p$ a number or a function? If it is a number, then the integral is trivial ($\int \delta(\alpha -i)d\alpha = 1$ iff i is within the integration bounds). Feb22 answered How to quickly recognize closed sets and open sets in $\mathbb{R}^2$ Feb11 answered Verifying that a given set is an ideal Feb11 comment Let $a,b$ be positive integers such that $a\mid b^2 , b^2\mid a^3 , a^3\mid b^4 \ldots$ so on , then $a=b$? So it's really a question of simple arithmetic. If the powers are $x$ and $y$ then what this amounts to is $2ny-y \le 2nx \le 2ny+y$ Feb11 comment Let $a,b$ be positive integers such that $a\mid b^2 , b^2\mid a^3 , a^3\mid b^4 \ldots$ so on , then $a=b$? If $a \neq b$ then there can be 2 options - either there is an uncommon prime divisor, or there is only a difference in prime powers. Think about what this means for the powers of prime divisors... Feb2 answered Statistics: how to equate two estimators Dec17 comment Monty hall problem extended. It's very similar to having a dog, just a little livelier. Dec10 awarded Yearling Dec9 answered Is there a polynomial, in terms of $x^4$ and $x$, whose graph is not below the graph of the function $y=x^3$ Dec8 answered Wrapping function is continuous but why is its inverse function not continuous? Dec1 awarded Commentator Dec1 comment Limit of square root times difference of nth roots Quick suggestion: search for a common denominator... Nov5 awarded Critic Jan30 comment How does one find the Fourier coefficients of a piecewise continuous function? restart using the complex Fourier series and retreat back to $a_k$ and $b_k$ later. Dec21 comment Definition of topology But epsilons and deltas only work when you have a metric. They won't take you far. Dec21 answered Definition of topology Dec20 comment The rearrangement theorem for improper convergent series OK. OK. This is a case of unclear notation. I haven't seen the term "improperly convergent" for a series in that sense before. It's not a widely used terminology.