Recent content by annoymage

yes, yes, that's it ! thanks !

Hi, I've heard of this one name, or rather it's a name of language that they use on chatting or using password, that goes like changing a to @, o to (), s to $, etc etc. Anyone knows what is the name of that thing?

Firstly, where do I have to post if i have a question on LaTeX? and here's the question, \vdash_{A} how do I make that subscript exactly below the line - on that simbol?

it's a theorem, not definition

hmm, you know xg-1 in in the kernel, then (xg-1)g is in {kg | k ∈ ker i}, so this conclude that i^−1(h) is subset of {kg | k ∈ ker i}. now left to show is {kg | k ∈ ker i} subset of i^−1(h)

hmm, may i ask what trivial homomorphism means?

let x be the preimage of h, ie: i(x)=h=i(g), then i(xg-1)=e, then what can you say about x??

Z12 are group on operation addition, not multiplication

you mean this right? A=\{n\in \mathbb{Z}~\vert~n> c\} thanks you soo much

hmm then i got m-1 \leq c \leq m it's not the same as m-1 \leq c<m right?

Homework Statement let a,b be positive integer , c is real number, and -a<c<b i want to show there exist integer m, -a \leq m \leq b such that m-1 \leq c<m i don't know any easy method, but this is where i got now, Let set S=[m|-a \leq m \leq b] So by contradiction, suppose that for all m...

thank you very much

aaaaaaaaaaaarghh, yes yes, thank you ^^ hmm, now i have to prove that (a_n) is convergent, i suspect i should prove that (a_n) is bounded then, i know (a_n) is monotone then, (a_n) must be converging right? then continue like i was doing above right?

Homework Statement Results i) if (a_n) tends to L as n tends to infinity, then a_{n_r} tends to L as r tend to infinity ii)if (a_n) tends to infinity as n tends to infinity, then a_{n_r} tends to infinity as r tend to infinity using this result prove that if (a_n) is an increasing...

if you want to show their element is closed, you have to show any two element in g^{-1}Ng when multiply, it still in g^{-1}Ng , not in G. so if x and y is in g^{-1}Ng , what can you say about x and y?? and you need to show x*y is in g^{-1}Ng p/s: sorry if my english terrible