anonymous
  • anonymous
please help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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anonymous
  • anonymous
@jtvatsim
anonymous
  • anonymous
@zzr0ck3r

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More answers

zzr0ck3r
  • zzr0ck3r
I am having the same problem as last time. I can't open it. I will be right back, my wife needs some help.
anonymous
  • anonymous
can you open it now?
zzr0ck3r
  • zzr0ck3r
nope
zzr0ck3r
  • zzr0ck3r
I only have wordpad on this pc.
anonymous
  • anonymous
ok. let me post it one by one but its up to ten
anonymous
  • anonymous
1 Let X= {x,y} and T=ϕ,X,x .Determine the closed set a)X b) X,{y} c)X,ϕ,y d) x,y
zzr0ck3r
  • zzr0ck3r
take a screen shot and post the jpg.
anonymous
  • anonymous
ϕ means empty set
anonymous
  • anonymous
i choosed c
zzr0ck3r
  • zzr0ck3r
`\(\emptyset\)`
zzr0ck3r
  • zzr0ck3r
Should it say \(\mathcal{T}=\{\emptyset, X, \{x\}\}\) ?
anonymous
  • anonymous
yes that is the topology
anonymous
  • anonymous
the question is what are the closed sets?
zzr0ck3r
  • zzr0ck3r
sec, can you post a pic? I am not sure if I am getting everything. I think it is missing a bunch of \(\{,\}\).
anonymous
  • anonymous
\[\let X={x,y} and ....T={\emptyset,X,x} \] what are the closed sets
zzr0ck3r
  • zzr0ck3r
x is not a set here. should it say \(\{x\}\)?
zzr0ck3r
  • zzr0ck3r
Sorry man, this all makes a huge difference. I cant answer without seeing the question. as it is posted it cant be answered. \(\{X,\{y\}\}\) is weird...
anonymous
  • anonymous
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anonymous
  • anonymous
may be it was a typo error. they din't close i think they out to
anonymous
  • anonymous
@zzr0ck3r
zzr0ck3r
  • zzr0ck3r
the only thing that is a set is X and it is closed.
zzr0ck3r
  • zzr0ck3r
The other choices are not sets.
zzr0ck3r
  • zzr0ck3r
And if they are they are not subsets of the space X, and thus are not closed with respect to the given topology
anonymous
  • anonymous
assuming the the question was set correctly, what option should have been correct ?
zzr0ck3r
  • zzr0ck3r
These questions are all messed up, they dont make sense...
zzr0ck3r
  • zzr0ck3r
for something to be closed, they need to be a subset of the space, the only thing that was a subset of the space was the space itself.
anonymous
  • anonymous
which implies that it out to be A
zzr0ck3r
  • zzr0ck3r
yes, but the others are not even defined. I think where ever you got this, there is a problem with displaying all the characters.
zzr0ck3r
  • zzr0ck3r
the thing they call a topology is not even a topology, as a topology is a set, and must have parentheses around it.
anonymous
  • anonymous
ok thanks
zzr0ck3r
  • zzr0ck3r
since I assume there should be parentheses, well then I dont know if they mean for there to be parentheses on other things, and without that information this cant be answerd.
anonymous
  • anonymous
A space (X,Td) is called____________ if and only if (i) ϕϵ (ii) T contain open set whose compliment are finite sets discrete topology indiscrete topology cofinite topology metric topology
anonymous
  • anonymous
i think indiscrete topology
zzr0ck3r
  • zzr0ck3r
you are not listening when I tell you that I cant answer anything from that page. If you have something else I will gladly help, but theses questions are messed up. Ill check back tomorrow.
anonymous
  • anonymous
sir, in the first question i asked . i assume that the option B is not correct because ,it is not in T. right ?
anonymous
  • anonymous
i.e {y} is not in T

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