[…] and means for unfoaming the foamable material by collapsing the bubbles thereof.

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Exercise 21 Show that every antisymmetric bilinear form on R ³ is a wedge product of two covectors.

One morning I had been driven to the precarious refuge afforded by the steps of the inn, after rejecting offers from the Celebrity to join him in a variety of amusements. But even here I was not free from interruption, for he was seated on a horse-block below me, playing with a fox terrier.