In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: One object named for this man is a cuboid whose sides and face diagonals have integral lengths, his namesake bricks. A function named for this man is the number of integers less than n relatively prime to n, his totient function. The quantity chi, this man's namesake (*) "characteristic," is equal to vertices plus faces minus edges for polyhedra. This mathematician ushered in graph theory in proving that a certain traversal was impossible because it had none of his namesake cycles. His identity states that a certain number to the power of i times pi equals negative 1. For 10 points, name this Swiss mathematician who solved the Seven Bridges of Konigsberg problem, the namesake of a constant with Mascheroni who did work with the number e.
A:
Science