Generalized Becker finiteness conjecture for higher Pythagoras numbers

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Let RR be a commutative ring with identity. For a positive integer ss, let p2s(R)p_{2s}(R) denote the least number of 2s2s-th powers needed in the relevant representation defining the higher Pythagoras number, when this number is finite. Generalized Becker finiteness conjecture. The following conditions are equivalent:

  1. p2(R)<∞p_2(R)<\infty.
  2. p2s(R)<∞p_{2s}(R)<\infty for some ss.
  3. p2s(R)<∞p_{2s}(R)<\infty for all ss.

Becker's theorem establishes this equivalence for fields, while the conjecture asks for the corresponding statement for arbitrary commutative rings with identity. Its status is open in the source.

References

Primary source

Tomasz Kowalczyk and Julian Vill, “On higher Pythagoras numbers of polynomial rings”, arXiv:2311.07356 (2024).

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