Arabic mathematics finally began to decline in the15th century, marked by the death of Al Cassie. Kathy is good at calculating, and she is good at calculating for a long time. To be precise, he seems to like this calculation. For example, he worked out the sixth root of a long hexadecimal number, which is definitely a feat, and I think it is no less than Zu Chongzhi's calculation of pi. Since Kathy's death, Arabic mathematics has not found an influential mathematician. At least it can be ignored, which should be attributed to the cultural collapse of the Muslim world, more thoroughly than the collapse of the empire. Fortunately, when Arabic mathematics began to decline, European academic circles were on the rise. So some people think that what Arabs do is to "refrigerate" Greek science until Europe is ready to accept it. Of course, this is inappropriate. Hundreds of years later, when the Arabs handed mathematics to the Latin world, it was much richer than when the illiterate Arab conquerors first contacted him in the 7th century.