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I am currently reading some theoretical economics books and, of course, many mathematical expressions appear. I kind of guess their meaning, but it takes a lot of time and, after all, my guesses are assumptions rather than certainties. Many times I find myself lost even in the easiest questions like: why use an exponent instead of a multiplication in this particular case? And even if I kind of guess their meaning, I struggle to understand the creation process of a model. I have looked for mathematical modelling textbooks but all I kind find are introductions to models for processing big data or data analysis. I would like to read a textbook that is fully focused on theoretical models. Also, the books I find for mathematical economics and such are books that teach how to solve specific problems rather than how to formulate models. Does anyone know any good textbook for someone like me? Thank you.