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van Kampen's Theorem

In the usual diagram of inclusion homeomorphisms, if the upper two maps are injective, then so are the other two.


References

Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, pp. 74-75 and 369-373, 1976.




© 1996-9 Eric W. Weisstein
1999-05-26