A injection is a function
f:X→Y such that
y∈Y there is at most one
x∈X such that
Another way of stating this is that if
f(x)=x is an injection.
f(x)=x2 is not an injection.
A. Menzes, P. van Oorschot, and S. Vanstone, Handbook of Applied Cryptography. CRC Press, 1996.
Copyright © 2014 Barry Watson. All rights reserved.