Finding a solution to a stubborn mathematical problem can be a daunting task, but there are several synonyms that can be used to describe such a challenge. One could refer to it as a complex mathematical conundrum, a perplexing equation, an intricate formula, a knotty math problem, a vexing numerical puzzle, or a challenging mathematical quandary. Mathematics is a discipline that requires patience, dedication, and critical thinking skills, especially when dealing with stubborn problems. However, with persistence, diligence, and the help of advanced tools and technology, any stubborn mathematical problem can be conquered.