Recent content by Hydroxide

Hi, do you have a link to the PDF? I've looked on the EPA site, but can't find it. Thanks!

Hey, thanks. I can't choose global warming, acid rain of photochemical smog though. Thanks anyways

Hi, this sounds excellent. I've done some searching. Found lots of stories about it, but can't seem to find the PDF. EPA website seems like a maze! If it is not too much, could you give me a link? Cheers

Homework Statement Hi, I just needed help finding a social relevance chemistry topic to write about 1000 words on. It needs to: -have lots of gritty chemistry -be socially relevant today (environmental and economic impacts) -have two sides to the argument I'm struggling to...

thanks everyone and especially matt grime for your patience I've done it now.

How would I show that they are Linearly independent. But part (ii) is : Suppose {u,v,w,x} is a basis for R4. Show that {u+v,v+w,w+x,x+u} is NOT a basis for R4 So I can't really do it by inspection. Thanks guys

My bad, its fixed now

Homework Statement Suppose {u,v,w} is a basis for (R3). Show that {u+v,v-w,w-u} is also a basis for (R3).The Attempt at a Solution By definition, u,v and w are linearly independent and they span (R3). I really don't know where to go from here though. Thanks

ATA is n x n We haven't covered ranks yet I know that ATA can reduced so that it has one row of zero's hence det=0. But I don't know how to show it in general.

Cheers I've got the first question now. Was easier than i thought. I still can't do 2) though. Could you explain further please?

Homework Statement 1) Let A be an n x n matrix with A^2 -4A +5I = 0. Show that n must be even. 2) Let A be an m x n matrix where m<n. Show that det(AT x A) = 0 The Attempt at a Solution 1) (A-2I)^2 +I=0 Not sure what to do after this though Thanks in advance

Yeah I figured that one out, but thanks anyway

But that leaves me with [|x+2|]=[|2x-3|] correct? So can i say [|x-5|]=0 ? hmmm, seems to simple

Homework Statement Q1 [|x+2|]=2[|x|]-3 Q2 If f is even and g is odd, is fog even, odd or neither Homework Equations The Attempt at a Solution Q1 Not sure. Can someone please give me a start on this? I think if I knew some properties of greatest integer functions I could work...

Hey, Thanks to everyone who has contributed to this thread, its been a good read. I am a Yr 11 Australian student who is really good at maths. In fact, this year I'm doing first year maths at University. I'm not sure about my physics ability since this is my first year doing it. However I...