Mathematical fiction is a type of story that uses math concepts to help tell the story. It might have characters who use math to solve a problem or figure something out, or it could use math concepts in a more abstract way to lead the reader to think about the story in a different way.
Imagine you're playing with blocks and trying to build a tower. You start with a big base, and then add more and more blocks on top, making it taller and taller. Each time you add a block, you're using math concepts like balance and stability to make sure the tower doesn't fall over.
Now imagine that the tower is the story you're trying to tell, and the blocks are the math concepts you're using to help build it. Maybe you have a character who's trying to solve a mystery, and they have to use geometry to figure out where the clues are leading them. Or maybe you have a story that's about patterns and repetition, and you use mathematical sequences to help move the plot forward.
Mathematical fiction is a way of using math to tell a story in a more creative and engaging way. It can help readers see the world from a different perspective and inspire them to think about how math applies to their own lives.