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Preprint Sep 2026

Directional Optimal Sub-Gamma Scales for Infinitely Divisible Laws

Fixing the quadratic proxy in a sub-gamma bound at the true variance leaves a scale to optimize, and a two-sided infinitely divisible law generally requires different scales in the two directions. For a centered law with finite nonzero variance, we normalize its Kolmogorov canonical measure and multiply the resulting v...

Yi-Chuan Chen, Xin Wang · 2 citations
Preprint Sep 2026

Feasible Frontiers for Sub-Gamma Envelopes: the Variance--Pole Trade-off for Infinitely Divisible Laws

A right sub-gamma bound is described by a quadratic proxy $v$ and a pole $c$, and the pair is not unique: enlarging either preserves it. Fixing $v$ at the variance $V$ removes the ambiguity at quadratic order but is a convention, not a consequence. For centered infinitely divisible laws with finite nonzero variance we...

Yi-Chuan Chen, Xin Wang · 0 citations
Preprint Sep 2026

Minimal Radial Sub-Gamma Envelopes for Infinitely Divisible Random Vectors

Let X be a centered infinitely divisible random vector with finite second moment and covariance matrix Sigma. We define the radial pole C_X(t) as the smallest scale in a right sub-gamma bound forwhose quadratic proxy is fixed at the true variance t^T Sigma t. A canonical directional measure and an independent Beta(1,2)...

Yi-Chuan Chen, Xin Wang · 1 citation · ⚡1
Open access Aug 2026

Metabolic engineering of Lacticaseibacillus paracasei alleviates post-acidification and reshapes metabolite profiles in probiotic yogurt

Post-acidification during storage limits the use of multiple probiotics in fermented dairy products. In this study, the ldh gene was deleted in Lacticaseibacillus paracasei Zhang (LCZ), resulting in 45% reduction in lactic acid production. Co-fermentation of the engineered strain with commercial starters effectively co...

Bohai Li, Long-Xiang Ye, Rong Dai et al. · 0 citations

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