Read the following premise and answer if the hypothesis is true.
In symbolic computation (or computer algebra), at the intersection of mathematics and computer science, the Risch algorithm is an algorithm for indefinite integration. It is used in some computer algebra systems to find antiderivatives. It is named after the American mathematician Robert Henry Risch, a specialist in computer algebra who developed it in 1968.
Hypothesis: Robert Henry Risch developed more than just the Risch algorithm. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
It's impossible to say
It's possible that he did, but the hypothesis only mentions the Risch algorithm.