The genuine mixed Schmidt conjecture for three weights

About 16 years old · traced to

Let D\mathcal{D} be as above. For triples satisfying

0≤i,j,k≤1,i+j+k=1,0\leq i,j,k\leq 1,\qquad i+j+k=1,

let BadD(i,j,k)\mathbf{Bad}_{\mathcal{D}}(i,j,k) be the set of (x,y)∈R2(x,y)\in\mathbb{R}^2 for which there exists c(x,y)>0c(x,y)>0 such that

max⁡{∣q∣D1/i,∥qx∥1/j,∥qy∥1/k}>c(x,y)q−1∀q∈N,\max\left\{|q|_{\mathcal{D}}^{1/i},\|qx\|^{1/j},\|qy\|^{1/k}\right\}>c(x,y)q^{-1}\qquad\forall q\in\mathbb{N},

with the boundary cases interpreted as specified in the source. The genuine mixed Schmidt conjecture. For any (i1,j1,k1)(i_1,j_1,k_1) and (i2,j2,k2)(i_2,j_2,k_2) satisfying these conditions,

BadD(i1,j1,k1)∩BadD(i2,j2,k2)≠∅.\mathbf{Bad}_{\mathcal{D}}(i_1,j_1,k_1)\cap\mathbf{Bad}_{\mathcal{D}}(i_2,j_2,k_2)\neq\emptyset.

The source explains that this interpolates between the classical Schmidt conjecture and the mixed Schmidt conjecture studied in the paper. It remains open in the stated generality.

References

Primary source

Dzmitry Badziahin, Jason Levesley and Sanju Velani, “The mixed Schmidt conjecture in the theory of Diophantine approximation”, arXiv:1001.4445 (2010).

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