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Mathematics 18 Online
OpenStudy (anonymous):

will post a problem

OpenStudy (anonymous):

When is B aneuclidean topology on R?

OpenStudy (anonymous):

@zzr0ck3r

OpenStudy (anonymous):

is it when B=(a,b):a,bϵR,a=b

OpenStudy (anonymous):

?

OpenStudy (anonymous):

@zzr0ck3r

OpenStudy (zzr0ck3r):

`\(B=\{(a,b) | a,b\in R, a<b\}\)` This will give \(B=\{(a,b) | a,b\in R, a<b\}\)

OpenStudy (zzr0ck3r):

so put \ before { and }

OpenStudy (anonymous):

ok thanks sir

OpenStudy (zzr0ck3r):

that was the problem with those last questions, I could not tell where the parentheses were.

OpenStudy (zzr0ck3r):

Eclidean topolgy is just the real line as you know it. The B is for basis

OpenStudy (zzr0ck3r):

Euclidean Topology*

OpenStudy (anonymous):

ok. when is B the lower limit on R

OpenStudy (zzr0ck3r):

I don't understand the question

OpenStudy (zzr0ck3r):

oh the lower limit topology?

OpenStudy (zzr0ck3r):

Then \(\mathcal{B}=\{[a, b)| a,b\in \mathbb{R}, a<b\}\)

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

is that it?

OpenStudy (anonymous):

or \[B_d\](x,ϵ)⊃⋃

OpenStudy (anonymous):

??????

OpenStudy (zzr0ck3r):

sorry eating :)

OpenStudy (zzr0ck3r):

the first one

OpenStudy (anonymous):

?

OpenStudy (zzr0ck3r):

correct

OpenStudy (zzr0ck3r):

we just answered this

OpenStudy (anonymous):

i think the first one

OpenStudy (zzr0ck3r):

correct

OpenStudy (anonymous):

Projections of X x X

OpenStudy (anonymous):

projection X x Y

OpenStudy (anonymous):

which of them sir?

OpenStudy (anonymous):

or projections of X^2 x Y^2

OpenStudy (zzr0ck3r):

sec, let me read

OpenStudy (zzr0ck3r):

should that say \(\pi_2:X\times Y\rightarrow Y\)?

OpenStudy (anonymous):

yes sir, typo error

OpenStudy (zzr0ck3r):

these maps are projection maps from \(X\times Y\)

OpenStudy (anonymous):

ok. thanks . i have more, can i ask please?

OpenStudy (zzr0ck3r):

Sure, but open a new question. This one takes to long to sroll and find things. It is cluttered.

OpenStudy (zzr0ck3r):

also, I am going into town soon, but I will be back in a few hours.

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