Question: Why does this computation hang?

The following program hangs on the last command and a hard restart is required. The computation of a 2 x 2 matrix times a 2-vector is not that hard. Any ideas as to what is happening?

Another question: if v is a vector that depends on x and y say why does
not work?

It should only take a few lines of code to change v=0 to the system {components of v = 0}

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