Mathematics
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OpenStudy (anonymous):
will post a problem
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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
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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
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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 \(\mathcal{B}=\{[a, b)| a,b\in \mathbb{R}, a<b\}\)
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
is that it?
OpenStudy (anonymous):
or
\[B_d\](x,ϵ)⊃⋃
OpenStudy (anonymous):
??????
OpenStudy (zzr0ck3r):
sorry eating :)
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OpenStudy (zzr0ck3r):
the first one
OpenStudy (anonymous):
?
OpenStudy (zzr0ck3r):
correct
OpenStudy (zzr0ck3r):
we just answered this
OpenStudy (anonymous):
i think the first one
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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
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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?
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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.