8,078 reputation
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bio website linkedin.com/in/gt6989b
location New York, NY
age 36
visits member for 3 years, 4 months
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Apr
28
comment A linear growth model with immigration
@Danny $o(h)$ and $-o(h)$ is the same thing.
Apr
28
comment What does “Formulate the system of equations for a finite difference discretisation of the problem” mean?
What is meant by the question is, find the set of linear equations one would need to solve to get the numerical approximation to the problem you described via the method of finite differences.
Apr
24
comment Complicated but easy problem solving?
For the purpose of this problem, 03 is a more convenient representation than plain 3
Apr
24
comment Complicated but easy problem solving?
@AndréNicolas misread the problem, was counting numbers with 3 not actual occurrences. Fixed now.
Apr
24
comment Complicated but easy problem solving?
@gnasher729 fixed, thanks
Apr
13
comment Joint Probability Distribution Function
@Did is that integral not the probability that X=Y.
Apr
9
comment Logarithmic Equations and solving for the variable
@ajotatxe I'm sorry, I revised a couple of times, not sure if your remark is still relevant?
Apr
9
comment Logarithmic Equations and solving for the variable
+1 for thinking about the problem before posting here.
Apr
9
comment Need to check answer-Factoring out from surds
I think he meant $n^{3/2}$ not $n^3/2$
Apr
9
comment Conditional Probability - Bayes' Theorem
Why not apply the approach from math.stackexchange.com/questions/745646/…, I intentionally did not answer the second question, it is exactly the same, no?
Apr
9
comment Probability applied to economics
@ScottGoddard but the problem says that "$30\%$ of the professors who received this material adopted the book", so $(S,A) = 0.3 \times 0.8 = 0.24$!
Apr
9
comment Why does convexity of a function required the following
@user2654176 see the edit, this is equivalent to $f''>0$ (assume $f''$ exists).
Apr
9
comment Probability applied to economics
@ScottGoddard Looks like you evaluated incorrectly. What numbers did you get for each of the 4 sets, and how did you get them?
Apr
9
comment Why does convexity of a function required the following
@user2654176 I don't understand what you are asking.
Apr
9
comment Limits: $\lim_{x\to0^+}xe^\frac{-1}x$ and $\lim_{x\to0^-}xe^\frac{-1}x$
Can you please exhibit at least some attempt at solving the problem yourself? Then we can comment and give some hints. This is not the "society of people who do your homework for you."
Apr
9
comment What's the MLE of $\frac1\lambda$ for $f(x)=\frac1\lambda\exp − \frac x\lambda$?
Please clarify the equations in the text, they way it is phrased makes no sense to me.
Apr
9
comment Suppose $A, B$, and C are sets. Prove that $C\subset A\Delta B \Leftrightarrow C \subset A \cup B$ and $A \cap B \cap C = \emptyset $
@GabeCarr the phrase "the statement A ⋂ B ⋂ C must be an empty or null set" is wrong: $A \cap B \cap C$ is not a statement, and statements cannot be empty or null sets. What is meant to say is that the set $A \cap B \cap C$ is empty, i.e. $A \cap B \cap C = \emptyset$
Apr
9
comment What is the shortest way to write the number $1234567890$?
@DavisYoshida how do you denote $55_{64}$ by one digit -- rubik's notation is only good for base 36 (10 digits + 26 letters)?
Apr
9
comment What is the shortest way to write the number $1234567890$?
One approach is to find some relatively short base, and it shrinks fast, e.g. it is $499602D2_{16}$ (same 10 digits).
Apr
9
comment Evaluate the limit
@rubik Missed the all real numbers part, thank you