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anonymous

  • one year ago

please help

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    @jtvatsim

  3. anonymous
    • one year ago
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    @zzr0ck3r

  4. zzr0ck3r
    • one year ago
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    I am having the same problem as last time. I can't open it. I will be right back, my wife needs some help.

  5. anonymous
    • one year ago
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    can you open it now?

  6. zzr0ck3r
    • one year ago
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    nope

  7. zzr0ck3r
    • one year ago
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    I only have wordpad on this pc.

  8. anonymous
    • one year ago
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    ok. let me post it one by one but its up to ten

  9. anonymous
    • one year ago
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    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

  10. zzr0ck3r
    • one year ago
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    take a screen shot and post the jpg.

  11. anonymous
    • one year ago
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    ϕ means empty set

  12. anonymous
    • one year ago
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    i choosed c

  13. zzr0ck3r
    • one year ago
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    `\(\emptyset\)`

  14. zzr0ck3r
    • one year ago
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    Should it say \(\mathcal{T}=\{\emptyset, X, \{x\}\}\) ?

  15. anonymous
    • one year ago
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    yes that is the topology

  16. anonymous
    • one year ago
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    the question is what are the closed sets?

  17. zzr0ck3r
    • one year ago
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    sec, can you post a pic? I am not sure if I am getting everything. I think it is missing a bunch of \(\{,\}\).

  18. anonymous
    • one year ago
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    \[\let X={x,y} and ....T={\emptyset,X,x} \] what are the closed sets

  19. zzr0ck3r
    • one year ago
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    x is not a set here. should it say \(\{x\}\)?

  20. zzr0ck3r
    • one year ago
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    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...

  21. anonymous
    • one year ago
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  22. anonymous
    • one year ago
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    may be it was a typo error. they din't close i think they out to

  23. anonymous
    • one year ago
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    @zzr0ck3r

  24. zzr0ck3r
    • one year ago
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    the only thing that is a set is X and it is closed.

  25. zzr0ck3r
    • one year ago
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    The other choices are not sets.

  26. zzr0ck3r
    • one year ago
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    And if they are they are not subsets of the space X, and thus are not closed with respect to the given topology

  27. anonymous
    • one year ago
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    assuming the the question was set correctly, what option should have been correct ?

  28. zzr0ck3r
    • one year ago
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    These questions are all messed up, they dont make sense...

  29. zzr0ck3r
    • one year ago
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    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.

  30. anonymous
    • one year ago
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    which implies that it out to be A

  31. zzr0ck3r
    • one year ago
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    yes, but the others are not even defined. I think where ever you got this, there is a problem with displaying all the characters.

  32. zzr0ck3r
    • one year ago
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    the thing they call a topology is not even a topology, as a topology is a set, and must have parentheses around it.

  33. anonymous
    • one year ago
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    ok thanks

  34. zzr0ck3r
    • one year ago
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    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.

  35. anonymous
    • one year ago
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    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

  36. anonymous
    • one year ago
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    i think indiscrete topology

  37. zzr0ck3r
    • one year ago
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    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.

  38. anonymous
    • one year ago
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    sir, in the first question i asked . i assume that the option B is not correct because ,it is not in T. right ?

  39. anonymous
    • one year ago
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    i.e {y} is not in T

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is replying to Can someone tell me what button the professor is hitting...

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