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Wilmer
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Yesterday,
22:28
MarkFL
replied to a thread
x4.01 Find an equation for the level surface of the function
in
Calculus
Basically, you want: f(x,y,z)=f\left(1,\ln(4),\ln(9)\right) So, what do you get?
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1 replies | 23 view(s)
Yesterday,
15:48
MarkFL
replied to a thread
Post Body CSS For Specified Users
in
vBulletin Products
Update - Version 1.2.1: More bug fixes.
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2 replies | 63 view(s)
Yesterday,
04:00
MarkFL
replied to a thread
Post Body CSS For Specified Users
in
vBulletin Products
Update - Version 1.2: Minor bug fixes.
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2 replies | 63 view(s)
November 20th, 2017,
17:24
MarkFL
replied to a thread
Help with a Derivative
in
Calculus
Yes, and for clarity that would be: Can you explain why the smaller root is an unstable equilibrium while the larger root is stable.
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15 replies | 230 view(s)
November 20th, 2017,
17:09
MarkFL
replied to a thread
Help with a Derivative
in
Calculus
Oops...I failed to recall that I factored out a negative sign...so yes it is the other way around. (Bandit)
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15 replies | 230 view(s)
November 20th, 2017,
16:50
MarkFL
replied to a thread
Help with a Derivative
in
Calculus
What I would do here, if we are to look at the stability of the equilibria, is write: rP(K-P)-H=-\left(rP^2-rKP+H\right) The roots, by the...
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15 replies | 230 view(s)
November 20th, 2017,
03:39
MarkFL
replied to a thread
Help with a Derivative
in
Calculus
We see that r\d{P}{t} is common to both terms, so we have: ...
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15 replies | 230 view(s)
November 20th, 2017,
03:16
MarkFL
replied to a thread
Help with a Derivative
in
Calculus
If you are differentiating w.r.t $t$, then using the product rule, you would have: ...
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15 replies | 230 view(s)
November 19th, 2017,
22:28
MarkFL
replied to a thread
Combinations Question
in
Other Topics
That would be the correct number if the order in which the committee was chosen mattered, but in this case order doesn't matter. N={10 \choose...
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5 replies | 78 view(s)
November 19th, 2017,
22:21
MarkFL
replied to a thread
Combinations Question
in
Other Topics
Yes, that's what I was suggesting. :)
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3 replies | 59 view(s)
November 19th, 2017,
22:10
MarkFL
replied to a thread
Possible Combinations
in
Pre-Algebra and Algebra
No, not quite...you have 5 sandwich options, and then for the second option, you have 3 + 4 options: N=5(4+3)=\,?
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3 replies | 54 view(s)
November 19th, 2017,
17:55
MarkFL
replied to a thread
Inequality
in
Challenge Questions and Puzzles
My solution: S=\sum_{k=1}^n\left(\frac{1}{k^2}\right) We may write for $3\le n$: S<\frac{5}{4}+\int_2^n x^{-2}\,dx=\frac{7}{4}-\frac{1}{n} ...
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2 replies | 71 view(s)
November 19th, 2017,
13:18
MarkFL
replied to a thread
Matlab code for another Gillespie (Predator/Prey) type reaction. Edit the code as needed!
in
Mathematics Software and Calculator Discussion
Did you try zipping the file before uploading it?
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6 replies | 94 view(s)
November 18th, 2017,
16:07
MarkFL
replied to a thread
Suggestion for product
in
vBulletin Products
I've worked this into a vB product, which can be found here: DB Error Suppression Note: I've installed this here at MHB, and set the...
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6 replies | 111 view(s)
November 18th, 2017,
16:04
MarkFL
started a thread
DB Error Suppression
in
vBulletin Products
Overview: This product, upon installation, will make a backup copy of your "includes/class_core.php" named "includes/class_core_orig.php" and will...
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0 replies | 30 view(s)
November 18th, 2017,
14:19
MarkFL
replied to a thread
Suggestion for product
in
vBulletin Products
I was looking over the core file more closely, and I found that vB already has an error suppression algorithm in place (I don't know when this was...
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6 replies | 111 view(s)
November 18th, 2017,
00:01
MarkFL
replied to a thread
Suggestion for product
in
vBulletin Products
Unfortunately, none of the code provided in that thread works correctly here. (No)
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6 replies | 111 view(s)
November 17th, 2017,
15:39
MarkFL
replied to a thread
Inverse and differentation of an equation
in
Differential Equations
I would have first dealt with the question regarding why the given function is injective. We find: f'(x)=6x^2+7 Since...
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15 replies | 246 view(s)
November 17th, 2017,
12:29
MarkFL
replied to a thread
Suggestion for product
in
vBulletin Products
According to the product thread, the code that has to be added to the core file is different for version 3.x, but someone has provided the change....
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6 replies | 111 view(s)
November 17th, 2017,
01:51
MarkFL
replied to a thread
Inverse and differentation of an equation
in
Differential Equations
What I had in mind, is to look at the function's first derivative. If this derivative never changes sign, that is, has no real roots, or no real...
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15 replies | 246 view(s)
November 17th, 2017,
01:32
MarkFL
replied to a thread
Suggestion for product
in
vBulletin Products
Hey Jameson, I found something that should work for us, as far as I can tell, here: Suppress-o-matic - Stop database error spam It requires...
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6 replies | 111 view(s)
November 16th, 2017,
22:55
MarkFL
replied to a thread
User-enabled quotes within quotes
in
Questions, Comments, and Feedback
Hey Greg, We discussed having nested quotes about 4 years ago here: Using the Multi-Quote This Message feature If you read through that...
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1 replies | 30 view(s)
November 16th, 2017,
20:55
MarkFL
started a thread
Firefox Quantum
in
Chat Room
Earlier today, when I saw that Firefox was installing an update when I fired it up, I did my usual groaning facepalm and wondered what I might find...
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3 replies | 102 view(s)
November 16th, 2017,
16:49
MarkFL
replied to a thread
Inverse and differentation of an equation
in
Differential Equations
I would like to return to the question posted by Krylov: Your professor felt it important for you to be able to discuss why we know this...
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15 replies | 246 view(s)
November 16th, 2017,
15:37
MarkFL
replied to a thread
Eigenvector. Answer check.
in
Linear and Abstract Algebra
I get the characteristic equation: x^2-(1+4)x+(1\cdot4-0\cdot3)=x^2-5x+4=(x-1)(x-4)=0 Hence: \lambda_1+\lambda_2=1+4=5\quad\checkmark W|A...
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2 replies | 70 view(s)
November 16th, 2017,
15:25
MarkFL
replied to a thread
- HallsofIVY - great Stuff, my Friend!......
in
Introductions
Yes, welcome to MHB, John! (Clapping) It's nice to see appreciation posted for help given by one of our MHB Math Helpers. If you have any...
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2 replies | 199 view(s)
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October 31st, 2017
10:45 -
MarkFL
clicked Thanks for this post:
Re: Calculating Retail Price Based On Gross Profit Margin Percentage with commission
by
Wilmer
...which is retail...
10:45 -
MarkFL
clicked Thanks for this post:
Re: Calculating Retail Price Based On Gross Profit Margin Percentage with commission
by
Wilmer
Outch...the wording of...