协议
发表于 2025-3-23 12:36:30
Invertible Functions. Arc-length and Path-lengthLet I be an interval in ℝ, let f be a function I → ℝ, and let J = f(I). If f(x) = f(x′) ⇒ x = x′, then f is .. If so, there is function f.: J → I such that for each x ∈ I, f. (f(x)) = x, and for each y ∈ J, f(f.(y)) = y. (To be precise, f. = {(y,x)|(x,y) ∈ f}.) f. is called the . of f.
theta-waves
发表于 2025-3-23 14:44:06
Point-wise Convergence and Uniform ConvergenceLet f., f., … and f be functions A →ℝ, where A ⊂ ℝ.
Palate
发表于 2025-3-23 20:18:01
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ODIUM
发表于 2025-3-24 02:08:41
Absolute Convergence. Rearrangements of SeriesIf the series Σ|a.| is convergent, then the series Σa. is . convergent.
难听的声音
发表于 2025-3-24 04:38:20
Power SeriesA . series is a series of the form . where a. ∈ ℝ for each i. Evidently the convergence of a power series may depend on the value assigned to x. Evidently every such series converges for x = 0.
Neutral-Spine
发表于 2025-3-24 09:52:32
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CLAP
发表于 2025-3-24 12:42:33
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牛的细微差别
发表于 2025-3-24 16:32:38
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Endearing
发表于 2025-3-24 21:17:09
Cardinality. Finite and Countable SetsIn the preceding sections, we have been making informal use of the idea of a finite set. This idea is worth re-examining, and also we need to know about various types of infinite sets.
具体
发表于 2025-3-25 01:23:29
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