A Proof which indirectly shows a mathematical object exists without providing a specific example or algorithm for producing an example.

**References**

Courant, R. and Robbins, H. ``The Indirect Method of Proof.'' §2.4.4 in
*What is Mathematics?: An Elementary Approach to Ideas and Methods, 2nd ed.*
Oxford, England: Oxford University Press, pp. 86-87, 1996.

© 1996-9

1999-05-25