Внезапно матрица вторых производных

[birdwatcher]

A week later, in the middle of the afternoon, Mrs Leebody took up a position on the lowest step of the War Memorial, and began to speak. She was dressed for the occasion in a garment of hessian, her feet were bare, and there was a smudge of ash on her forehead.

John Wyndham, The Midwich Cuckoos