Eritque Arcus Math Notes

Delta-ball

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Def 13.2

𝐵𝛿(𝑥)={𝑦∣𝑑(𝑥,𝑦)≤𝛿}
closed 𝛿 ball around 𝑥
𝐵𝛿(𝑥)={𝑦∣𝑑(𝑥,𝑦)<𝛿}
open 𝛿 ball around 𝑥

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