The conversation between human and AI assistant.
Why does zero factorial (0!) equal one (1)?
Okay, that makes sense. Is zero factorial the only number that is defined this way?
No, there are a few other cases where this convention is used in mathematics. For example, the empty product, which arises when multiplying no numbers together, is defined to be equal to 1. Also, the power of 0 is defined to be 1, so 0 to the power of 0 is equal to 1 as well.