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Answers for “质数定理的形式化极限定义是什么?”

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The Prime Number Theorem is formally defined as the limit as x approaches infinity of the ratio of the actual prime-counting function π(x)π(x) to the estimate x/ln⁡(x)x/\ln (x) being equal to 1.

Conditions: x is a positive integer approaching infinity.; π(x)π(x) is the actual number of primes less than or equal to x.

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The video evaluates the density approximation 1/ln⁡(x)1/\ln (x) at x=100x = 100 trillion, yielding an estimated density of 3.1%. It compares this with the actual counted density of 3.2%, noting a 0.1% discrepancy that shrinks for larger numbers.

Conditions: x=100x = 100,000,000,000,000.; Density approximation is #PRIMES/x ~ 1/ln⁡(x)1/\ln (x).

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The video derives the Prime Number Theorem by treating the number of primes up to x as the area under the density curve. It simplifies this by assuming constant density, multiplying the size x by the density estimate 1/ln⁡(x)1/\ln (x) to get x/ln⁡(x)x/\ln (x).

Conditions: Uses the asymptotic density approximation 1/ln⁡(x)1/\ln (x).; The derivation assumes density is constant over the range for simplification.

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The x/ln⁡(x)x/\ln (x) approximation yields an estimated count of 3.1 trillion primes below 100 trillion. Compared to the actual count of 3.2 trillion, this is over 99.99% accurate.

Conditions: x=100x = 100,000,000,000,000.; The formula used is #primes(x) ~ x/ln⁡(x)x/\ln (x).