We distinguish non-degenerate operators as those with an invertible top coefficient in the expansion in the superderivative D.

It had been customary during the whole civil war, to decapitate state criminals by the instrument called the maiden; but Montrose was condemned to a more ignominious death , by a gibbet thirty feet high

I don't take kindly to threats.

Set ſophia aſyde, for euery iack raker And euery mad medler muſt now be a maker