Infinite superlinear growth of the gradient for the two-dimensional Euler equation

For two-dimensional Euler equation on the torus, we prove that the uniform norm of the gradient can grow superlinearly for some infinitely smooth initial data. We also show the exponential growth of the gradient for the finite time

On a conjecture by Y. Last

We prove a conjecture due to Y. Last on Jacobi matrices.Comment: preprint, final version published in J. Appr. Theor