This is actually a question I'm asking for an algorithm I write, but I think that this is the right place for the question.
I know that the definition of a descending sequence is that for every $n$:
$a_n > a_{n+1}$
A single number does not apply to the definition, does it mean that a single number isn't a descending series by definition?
Edit: The task asks me to write a function that gets a natural number, and outputs true if the digits of the number are a descending series, or false if not. I'm trying to think of radical possible inputs.