 # Tired of the pie? Here are 3.14 other math vacations that are worth celebrating.

Pi Day is a cheeky celebration of the mathematical constant found by dividing the circumference of a circle by its diameter, which is 3.14 rounded to two decimal places. If you have friends or coworkers wanting to demonstrate their fifth-grade geometry mastery and the sixth-grade home economics, you can even pull out a homemade pie. But what about those of us who have an appetite for math vacations and who find the constant celebrations too predictable?

## Fibonacci Day (23 November)

Each number in the Fibonacci sequence is the sum of the two numbers preceding it. If you had to add 1 and 1, you would have 2; if you then add 1 and 2, you will get 3, which is why November 23 is the most appropriate day to celebrate the titular contribution of the Italian mathematician Fibonacci to his field. How to mark the occasion? We suggest a potluck of Fibonacci: each contribution to the meal must be quantified by the sum of the two previous contributions.

Say Adam brings a salami and Sally brings a board of wood. It's a lame sausage party! But if Molly brings two bottles of wine, Jasper, three blocks of cheese and Dakota, five rolls, you now have a little antipasto Fibonacci.

## Hilbert Day (February 3)

The German mathematician David Hilbert had a lot of complicated problems – 23, to be exact, where the date – and he wanted someone else to solve them. Can not you tell? Give the guy a vacation! Hilbert's problems have helped to guide mathematical study throughout the twentieth century, although the divergent claims have been definitively resolved. However, several theorems have been developed over the past century to satisfactorily solve problems, such as Matiyasevich's theorem, which combines the theory of computability and number theory, and the Gelfond-Schneider theorem, which establishes that any algebraic number other than 0 or 1 squared irrational number is a transcendental number.

Hilbert Day should prompt us to look for answers, but to accept the unknown and ambiguity. To celebrate Hilbert, celebrants must eat a ripe tomato in recognition of the double identity of the plant as a fruit (according to botanists) and vegetable (according to others). Existence in this liminal space reflects the pleasure and the pain of making mathematical proofs.

## Pythagoras Day (December 16, 2020)

You will have ample time to prepare for these last holidays, when the sum of the month and the day squared is equal to the last two digits of the year. All mathematics enthusiasts probably had a difficult time in which they knew the length of both sides of a right triangle, but not the third. Fortunately, the Greek mathematician Pythagoras has covered us for about 500 years BC. AD with its theorem: you can calculate the length of the hypotenuse of a right triangle by finding the square root of the sum of the square values ​​of its other two lengths.

To celebrate the Pythagoras Day, it's about triangles: cut your sandwich diagonally, eat a slice of pizza or offer a gang to samosas – stay away from circles at all costs!