My life in topological space

Let X = {me, friends, textbooks, others}

and τ = {Φ, X, {friends, others}} 

Hence, τ is a collection of open subsets of X, and called topology on X. 

Because X – {me, textbooks} = {friends, others} which is contained in τ, {me, textbooks} is a closed set.                      Q.E.D.

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2 Responses to My life in topological space

  1. MinT says:

    อะไรกันคะเนี่ยพี่เฟรช… เป็น closed set ไม่ดีนะคะ… เป็น open set ดีกว่า… :)ใกล้ fall break แร้ว.. ไปไหนป่าว?

  2. PaiRach says:

    งง ….สบายดีป่าวครับพี่?

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