560 reputation
316
bio website cumberlandisland.blogspot.com
location TX, USA
age 36
visits member for 2 years, 5 months
seen Oct 17 at 15:58

Mathematical physicist working as a high school teacher. I am an evangelical Christian first, Reformed second, Presbyterian (Orthodox Presbyterian Church) third. Happily married with three children.


Oct
17
revised What is a closed chain (or circuit) that is used in solving a transportation problem (a special type of linear programming problem)?
Link to MHB version.
Oct
17
suggested suggested edit on What is a closed chain (or circuit) that is used in solving a transportation problem (a special type of linear programming problem)?
Sep
30
awarded  Explainer
May
11
answered How to solve $\displaystyle \lim_{x \to 0} \sqrt{x^2 + x^3} \sin \frac{\pi}{x}$ using squeeze Theorem?
May
7
awarded  Yearling
Apr
3
comment Inverse image of a Borel set is a Borel set under measurable function
Wonderful! Many thanks.
Apr
2
comment Inverse image of a Borel set is a Borel set under measurable function
Also, it is legal to form the expression $f^{-1}([-\infty,2))$, when the range of $f$ is $E$?
Apr
2
comment Inverse image of a Borel set is a Borel set under measurable function
Forgive the newbie question here, but with the $E$ you've set up, and the indiscrete topology, would that induce a particular measure?
Jan
23
comment How can I show that three statements are not logically equivalent to another?
I'm confused: your logical translation of the original premises into a single implication doesn't seem at all faithful. I would do this: $(p\lor q)\land (p \lor \neg q) \land (p \lor \neg r) \to r$.
Jan
23
comment How can I show that three statements are not logically equivalent to another?
Couple of questions, then: 1. Are you using natural deduction? If not, what rules of inference are you allowed? 2. What is the definition of a "proof of invalidity" in your logical system?
Jan
23
answered How can I show that three statements are not logically equivalent to another?
Dec
16
awarded  Revival
Aug
16
revised Strategies for Factoring Expressions with Four Terms
Fixed sign error in first example for Idea 2.
Aug
16
comment Strategies for Factoring Expressions with Four Terms
Very puzzling. The sign error is still there. I've submitted the edit again. Maybe it'll go through this time. I'm talking about the sign error in the $x^{2}-y^{2}-4x+4$ example - the first example for Idea 2.
Aug
16
suggested suggested edit on Strategies for Factoring Expressions with Four Terms
Aug
16
awarded  Enthusiast
Aug
15
suggested suggested edit on Strategies for Factoring Expressions with Four Terms
Aug
15
comment Strategies for Factoring Expressions with Four Terms
I just noticed that your first example in Idea 2 has a sign error, I think. I've fixed that.
Aug
14
revised Taylor Polynomial in Multivariable Case
Added chapter number to problem. Improved LaTeX and grammar.
Aug
14
suggested suggested edit on Taylor Polynomial in Multivariable Case