## Search found 4 matches

Fri Dec 10, 2010 3:15 pm UTC
Forum: Mathematics
Topic: Intersection between a plane and a straight line
Replies: 5
Views: 942

### Re: Intersection between a plane and a straight line

skullturf wrote: what it means in the context is that the entire line lives in the plane.

That is what the teacher said. But then he wrote: 0λ=0; λ=0/0; λ= ∞

And I had a nice discussion with him.
Fri Dec 10, 2010 2:17 pm UTC
Forum: Mathematics
Topic: Intersection between a plane and a straight line
Replies: 5
Views: 942

### Intersection between a plane and a straight line

This is probably easy for you, but I have a doubt when solving it. So, we have this system: r: {x= -2λ-3 {y= 2λ+1 {z= 3λ+4 And α: 2x+y-3z-1=0 The intersection between (r) and (α) is at 11λ+18=0; so λ= -18/11 (Correct me if I'm wrong) In this example, as λ is a real number, the plane and the straight...
Wed Dec 08, 2010 3:15 pm UTC
Forum: Mathematics
Topic: How hard is college level mathematics?
Replies: 36
Views: 9755

### Re: How hard is college level mathematics?

WTF does {\partial u \over \partial x}{dx \over dt} + {\partial u \over \partial y}{dy \over dt} = 2{du \over dt}. mean? The ratio between the change in u to the change in x when you change x by small amounts, times the ratio in the change in x to the change in t when you change t by small amounts,...
Tue Dec 07, 2010 10:57 pm UTC
Forum: Mathematics
Topic: How hard is college level mathematics?
Replies: 36
Views: 9755

### Re: How hard is college level mathematics?

I just registered in this forum to say the following: after reading the complete topic, I'm not sure if I'm feeling jealous or frightened right now. I mean, I'll be finishing high school this year, and I'll study Maths at the university. But here (I'm Spanish) we don't even have Calculus or Algebra ...