Remarks On Ornstein's Non-Inequality In Double-struck capital R2x2

We give a very concise proof of Ornstein's L-1 non-inequality for first- and second-order operators in two dimensions. The proof just needs a two-dimensional laminate supported on three points.

Automated summary

A concise proof of Ornstein's L-1 non-inequality for first- and second-order operators in two dimensions is presented, which only requires a two-dimensional laminate supported on three points.