5,935 reputation
31752
bio website ophirgame.com
location United States
age 72
visits member for 3 years, 9 months
seen Dec 14 at 23:13

(update) - My board game was funded on Kickstarter last summer (~$28500)!


I hereby commit to contributing to this site without any rudeness, sarcasm, accusation, or any other unloving speech. (In contrast to The Chaz 1.0)


Nov
6
answered Finding all monic polynomials of degree $1$
Nov
6
comment Finding all monic polynomials of degree $1$
Think of $x$ as $(x - 0)$. You need to check $(x-1)$ ... Up until [what]?
Nov
6
comment Finding all monic polynomials of degree $1$
Monic means leading coefficient is $1$. Linear means $ax+b$. Put the two together and you only have a few things to check by polynomial division...
Nov
6
comment Practical significance of $e$
$ e^x $ is its own derivative, which makes it quite significant in calculus.
Nov
6
comment Find the radius of convergence and interval of convergence
Is the radius $2$?
Nov
5
comment When proving that there is not rational number $m/n$ equal to $\sqrt{2}$, why does $m$ and $n$ must be not both even?
The contradiction comes when we conclude that both m,n are even later.
Nov
5
comment Why doesn't $1/x=0$ have any solution?
@Mas: I thought something similar. But I checked the edits and noticed that someone other than the OP added that tag in an edit.
Nov
4
comment Why doesn't $1/x=0$ have any solution?
@Shaun, $1=0$ in the extended complex plane? Fascinating! Maybe you should concern yourself more with helping the OP, and less with promoting this one bit of knowledge that you picked up.
Nov
4
comment Show that if $x>0$, then $\ln(x)\geq 1-\frac{1}{x} $
What things have you tried that didn't work?
Nov
4
comment Why doesn't $1/x=0$ have any solution?
It's not possible (insert boilerplate about unital rings here), which is the point.
Nov
4
comment Is 10 closer to infinity than 1?
Would anyone care to explain the punch line for me? (!)
Nov
2
answered By definition, how is a prime number represented?
Nov
1
comment It is valid that $A \subset B$. Prove that $A \cap B = A$
Do you know that $A \cap A = A$?
Nov
1
revised Solving 4th degree polynomials
deleted 1 characters in body
Nov
1
answered How to isolate y?
Nov
1
comment Logic Riddle - Multiple Choice
In 4), the innermost shape becomes the outermost. There is an alternation of black/white, and an alternation of which way the triangle is pointing. So I'd go with "B"
Nov
1
comment Logic Riddle - Multiple Choice
The first is E. You move from one picture to the next by rotating one stick a quarter turn to the left.
Nov
1
comment Complex number: Roots
Let $z = x + iy $ in the second one and use the definition of absolute value.
Nov
1
comment Logial Entailment vs. Material Conditional: binding free variables?
Also, en.wikipedia.org/wiki/Vacuous_truth
Nov
1
comment Area under the curve
The integral gives signed area. Also, what's the function for the ellipse?