# Global Graph Celebration Day 2023: Join Us for Raffle & Crossword

Today marks a special occasion that brings all graphistas and math enthusiasts together to celebrate the beauty and elegance of graphs. Happy Global Graph Celebration Day 2023!

On this particular day, we pay tribute to the incredible world of graphs and honor the birthday of the man behind it all: Leonhard Euler.

### The Origin of Graph: Euler and the Seven Bridges

Born on April 15, 1707, Swiss mathematician and physicist Leonhard Euler was fascinated by a puzzle known as the Seven Bridges of Königsberg. This puzzle was based on the real-life city of Königsberg (now Kaliningrad, Russia), where seven bridges spanned across the Pregel River, connecting various parts of the city. The challenge was to devise a route that would cross each bridge once and only once – a challenge no one had solved before.

Rather than focusing on the geographical layout of the city, Euler took a different approach and analyzed the problem from a mathematical standpoint. He simplified the city’s map by representing the land masses as nodes and the bridges that connect them as relationships.

Euler’s innovative approach to the problem led him to an unexpected revelation: it was, in fact, impossible to cross all seven bridges without retracing one’s steps. By analyzing the nodes and their relationships, Euler discovered that to traverse each bridge once and only once, each land mass (node) must have an even number of bridges (relationships) connected to it. However, in the case of Königsberg, all four land masses had an odd number of bridges. Using his newly discovered graph theory in 1736, he proved that the task is impossible.

### Celebrate With Us

From his daring exploration of the impossible Königsberg bridge problem to the birth of graph theory, Euler’s tale is a testament to the power of human curiosity and the potential for innovation that lies within each of us.

So, join us in raising a glass to the remarkable mind of Leonhard Euler, who paved the way for graph technology, revolutionizing the way we process, store, and analyze complex data in modern times.

Celebrate this special occasion with us, and join our fun activities and giveaways!

How much do you know about Neo4j and graph databases? Try filling out this crossword to test your knowledge.

#### Ebook Raffle

Fill in this form for a chance to win one of these comprehensive ebooks to help you master graph databases and analytics in no time:

#### T-Shirt Raffle on Graphville Livestream

Join our livestream on April 19 to learn the basics of Cypher and Neo4j. We’ll also be giving away T-shirts to the lucky viewers, so don’t forget to tune in!