Recent content by JonF

Valid point, Is there any possible valid security rational for keeping monitors at least 2 inches apart between the systems?

They really do have this rule in place for security reasons – it’s in our security handbook. I suspect it’s some legitimate security procedure that has been slowly bastardized by less knowledgeable security people over many years who didn’t understand the original requirement and it’s somehow...

My work has measures in place to prevent the possible security breaches you mentioned. My question is if there is any scientific basis for information possibly (no matter how unlikely) being transferred from monitor to monitor to the network in the manner I described?

I have a question about a security practice that is in place at my work. I think the practice isn’t based on credible science, and no one has been able give me a solid justification. My background is almost entirely in math so I was hoping to get an engineer’s take on this: Security is a...

Do you understand it formally? i.e. from a δ and ε point of view? Also do you understand differentiation from the point of view of limits and difference quotients? Before you move on to integrals I suggest you can do all of the following fluidly (and this is the typical order to learn them in...

good point, that makes it even easier

For a given N, whenever {-yN! \over N! - y} is an integer you should have a solution. Just solved for x.

How did you get the system is consistent without solving it? Have you learned about determinants? If so that is probably the method they want you to use All I suggested was realizing x3 = -x2, so you could clean up the system a bit to make it easier on yourself before you throw it in a...

Yes you are correct, that would mean that it is inconsistent. Taking the determinant of a 4x4 matrix is a pain. I suggest thinking about what this row tells you for a sec: 0 / 3 / 3 / 0 / 0. It should give you the information needed to make this 4x4 a 3x3.

Looks like it should be pretty easy with induction if you can prove the base case of: if x1,x2 are positive real numbers such that x1x2=1 then x13 + x23≥ x1 + x2 For the base case you know that x1x2=1 ⇒ x2= 1/x1 i.e. show x3 + 1/x3 - x - 1/x ≥ 0, for x ≥ 0 which shouldn't be to bad...

Do you know what critical points are?

Your general idea looks good. But you have to be careful, sometimes algebraic manipulation can alter the domain, which you have to take into account. Consider: f(x) = \frac{x^2 -1}{x-1}. Do you know any calculus? Since the function is continuous you can just find the critical points...

Whenever I tutored failing students I made them bring their test/homework and their book to their first appointment. That way I can see what they didn’t know, and how it was taught to them.

With all of that being said, ask yourself is your relation: {(x,x),(y,y),(z,z)}, symmetric and transitive? If it is symmetric and transitive what element(s) can you add so it isn't?

I remember asking this question in my high school geometry course and was told “what makes you think it wouldn’t be?”