# David Abrahamson, Rhode Island College – Mathematical Modeling

On Rhode Island College Week: Mathematical models help with predicating the future.

David Abrahamson, professor of mathematical sciences, discusses this exciting part of mathematical study.

Dave grew up in suburban Los Angeles and was a mathematics major at Harvey Mudd College.  He came to Brown University to earn a doctorate in differential equations in their renowned Division of Applied Mathematics, and he has lived in Rhode Island since graduate school. He has taught at Rhode Island College since 1986, during which time he has taught over 30 different courses.

## Mathematical Modeling

One of the most fascinating fields in applied mathematics is something called “mathematical  modeling.” In mathematical modeling, we try to create mathematical representations of real world processes. These representations can then be used to make predictions and, in particular,  to help with decision-making. Many phenomena are well-understood, and appropriate models  are in place: for example, the mathematical model for radioactive decay has been understood for  many decades, and important science like carbon dating is a result.

The challenge in mathematical modeling is how to deal with new situations. A model has to  satisfy multiple criteria. First, and most obviously, it has to actually fit the available data: the  numbers and predictions that a proposed model produces have to be a close match to the  information that is collected in the real world. Second, the model has to be based on science that  matches the process at hand. One cannot take a bunch of points on a graph and simply fit some mathematical equation to them without having good reason to believe that that equation is  appropriate to the underlying dynamics. There have been many examples of significant errors  where this part of the modeling process has been overlooked, including, in the spring of 2020,  some wildly incorrect predictions for the course of the Covid-19 epidemic in the United States.

A few years ago, I was part of a small team that modeled the population of a particular type of  marine life off the coast of the northeastern United States. An oceanographer collected data  about the population, and one of my colleagues and I worked with him to use a variant of a differential equations population model to learn what oceanic and atmospheric factors are most  important to the long-term value of the population. Every bit we learn about the various populations in the vast ocean food web is a step toward a more stable and sustainable future.

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