I had problems with the definition of the empty product. If the upper bound of the product is lower than the lower bound, there is no index in between, so the product is defined as 1. But isn't it possible, like with an integral, to swap the boundaries and make the product negative? Then the product wouldn't be empty?
2026-03-31 20:54:49.1774990489
can you swap the boundaries of an empty product?
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