## The Last Colloquium

Join us on Tuesday, April 16 at 7:00 p.m. in Room 102 of The Werf (aka VanderWerf) for the last colloquium of the semester. Professor Pearson will be presenting Euler’s solution to the Basel Problem, which asks the question, “What is the sum 1 + 1/4 + 1/9 + 1/16 + … ?” Professor Pearson will attempt to do justice to Euler’s remarkable genius in explaining his clever solution to this problem, and he will also discuss how this problem gave rise to one of the most important unsolved problems in mathematics today . . . and what all of this has to do with internet security. Students in Calc 2 or above will have studied the important background material for this talk, but students at all levels of math are invited to come and learn about this interesting story in the history of mathematics.

## Math Spring Social

## Stanford Pre-Collegiate Summer Institutes

Eleni Persinger, a high school student from Saugatuck and Hope College mathematics student, has been accepted into the Stanford Pre-Collegiate Summer Institutes. This is a three-week summer residential program where students engage in single-subject intensive study. Eleni will be studying discrete mathematics.

Besides discrete math, the institute also offers the mathematics of symmetry, number theory, cryptography, and knot theory as well as other science and non-science classes.

## NSF’s Graduate Research Fellowship

Sarah Petersen, a 2017 Hope College graduate in mathematics and current graduate student at the University of Notre Dame received an honorable mention in this year’s prestigious National Science Foundation’s Graduate Research Fellowship Program. This program recognizes and supports outstanding graduate students in NSF-supported science, technology, engineering, and mathematics disciplines who are pursuing research-based graduate degrees. Sarah is working in the mathematics field of topology.

## When is Easter?

Easter Sunday is still more than a week away, almost the end of the semester. Three years ago it was on March 27. Did you ever wonder how the date is determined? The easy answer is that Easter is the first Sunday *after* the first full moon *on* or *after* March 21. However, there is a more difficult mathematical answer to that question. In an old article written by Ian Stewart, Easter is a Quasicrystal, you can see the 10 steps needed to calculate the date of Easter for any given year.