Shadows and shifting

@article{Frankl1991ShadowsAS,
  title={Shadows and shifting},
  author={Peter Frankl},
  journal={Graphs and Combinatorics},
  year={1991},
  volume={7},
  pages={23-29}
}
It is shown how the shifting technique can be used to provide lower bounds on the shadows of families with specific intersection and union properties. 

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