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[数论] √2、∛2一直到六次根号2的积中最多能找到多少个使得无法用Q中的系数非全0线性组合=0

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hbghlyj Posted at 2025-3-31 01:44:41 |Read mode
Last edited by hbghlyj at 2025-3-31 02:15:27Linear independence of exponentials

令 $S=\{\sqrt{2}, \sqrt[3]{2}, \sqrt[4]{2}, \sqrt[5]{2}, \sqrt[6]{2}\}$ .令 $T=\left\{a_1 a_2 \cdots a_k \mid a_1, \cdots, a_k \in S\right\}$ .问 $T$ 中最多可以找到几个 $\mathbb{Q}$-线性无关的数


2,3,5两两互质,因此最大的线性无关组的大小至少是$2^3$。

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2024年清华大学领军8月试题第12题  Posted at 2025-4-1 13:24

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 Author| hbghlyj Posted at 2025-3-31 02:00:54
令 a=⁶⁰√2,将 S 表为
a³⁰ = √2, a²⁰ = ∛2, a¹⁵=∜2, a¹²=⁵√2, a¹⁰=⁶√2

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 Author| hbghlyj Posted at 2025-3-31 02:12:57
Last edited by hbghlyj at 2025-3-31 02:21:46 Python得到答案 24,是否正确?
  1. def compute_unique_sums():
  2.     numbers = [30, 20, 15, 12, 10]
  3.     dp = set()
  4.     for num in numbers:
  5.         new_sums = set()
  6.         new_sums.add(num)
  7.         for existing in dp:
  8.             new_sum = (existing + num) % 60
  9.             new_sums.add(new_sum)
  10.         dp.update(new_sums)
  11.     return dp
  12. unique_sums = compute_unique_sums() # Returns {0, 2, 5, 7, ..., 57}
  13. print("Number of distinct results:", len(unique_sums))
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2025-4-20 22:11 GMT+8

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