ITEC 122 2007fall ibarland

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lect10-function-basics-examples
proving one-to-one, onto
an example solution

Don't check out the solutions until you've given these problems some thought!

1. Prove or disprove that the function substring: Σ^*×N×N → Σ* (abbreviated: “s”) is one-to-one.
2. Is substring onto?
3. What is the (largest possible) domain of f(z)=1/(4-z²)?
4. (suggestions for other proof examples?)

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©2007, Ian Barland, Radford University Last modified 2007.Oct.05 (Fri)

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