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Apr
15
answered Question about the Continuum Hypothesis
Apr
14
reviewed Approve Autocorrelation and spectral density in MATLAB
Apr
14
comment If $x^2 +xy =10$ then when $x=2$ what is $\frac{\mathrm dy}{\mathrm dx}$?
do you mean "when $x=2$"?
Apr
14
answered Let $n\ge 2$ be an integer. If $\gcd(a,b^n)=1$, then $\gcd(a,b)=1$
Apr
14
reviewed Approve Linear Algebra nullSpace and multiplication
Apr
14
comment Probability Equation That I am missing here
"Don't ask me why but I just logically see that it is 50% so why?" That's a dangerous way to think about math.
Apr
13
answered Every n × n-matrix A with real entries has at least one real eigenvalue.
Apr
13
comment Writing Series as a Telescoping Series
yes, I was mistaken, sorry :(. I realized immediately and deleted my comment.
Apr
13
comment Proof by induction valid or not?
@DavidK I know. But either way, it is never correct to assume that the formula works for all $n$.
Apr
13
comment Writing Series as a Telescoping Series
That's not $S_N$. It's $t_N$ where $S_N=\sum_{i=9}^N t_N$.
Apr
13
answered Writing Series as a Telescoping Series
Apr
13
reviewed Approve Limited completeness and restricted quantifiers
Apr
13
reviewed Approve Is it possible to triangularize a matrix only by adding scalar multiples of rows to each other?
Apr
13
revised Proof by induction valid or not?
added 1169 characters in body
Apr
13
answered Proof by induction valid or not?
Apr
13
comment For any continuous function f(x), how can I split up the function and restrict the domain to find an inverse?
This is a pretty broad question. You might be better off coming up with one or a few simple examples of problems you want to be able to solve and trying to work through those, maybe with help from this community if you get stuck.
Apr
13
answered basic conditional probability proof
Apr
12
answered Prove $a_n = \begin{cases}1 & \text{if $n=2^k$ for some $k\in N$}\\ 0 & \text{otherwise} \end{cases}$ diverges.
Apr
12
comment When are $\Delta x$, $\delta x$, $dx$, and $\text{đ}x$ exactly the same? When are they approximately the same?
when you write $\delta x$, do you mean $\partial x$?
Apr
12
awarded  Citizen Patrol