👉 A capsheaf is a type of mathematical function that can be defined using the following recurrence relation: f(n) = f(n-1) + f(n-2) where n is an integer greater than or equal to 0. This function is often used in combinatorics and other areas where it's necessary to find the number of ways to choose k items from a set with n elements, such as choosing a subset of size k from a set of n elements.
