The probability that a matrix be nilpotent

@inproceedings{Fine1958ThePT,
  title={The probability that a matrix be nilpotent},
  author={N. J. Fine and I. N. Herstein},
  year={1958}
}
A roll-forming machine includes a plurality of roll-stands for moving material along a predetermined path and a plurality of die-stands for progressively transforming the material from an initial configuration to a desired configuration. The die-stands are mounted on and positioned by an elongate, rigid spine which permits conversion of the machine from one roll-forming configuration to another by replacing the spine and the die-stands mounted thereon with a different spine/die-stand assembly. 

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