[數撚圍爐區] What is Mathematics? (4)

未學convergence 啲test 嗰陣
成日要prove 條series converge 唔太識prove 諗住用Cauchy 做一輪整到佢最後細個ε
最後lecturer 又用啲普通方法爆頭幾個term做幾下執靚仔就prove到 到底幾時先真係用Cauchy

冇話要幾時用, Cauchy criterion只係唔識計limit既情況下almost by definition證明convergence既方法

Prove convergence都叫有辦法操 始終方法得個幾種，解決佢只係時間/熟練度問題

想問下有冇人會寫 R^n perp

數撚其實career path有咩可以揀
搵intern搵到頭都大撚埋

有咩問題

[member]原來打錯咗好多嘢

M is an n x n matrix where M^2 = I_n


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