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Euclid's most significant contribution to mathematics that is still in use today is his textbook, **The Elements**. This work systematically organized and presented the knowledge of geometry and number theory of his time, and it established a framework for mathematical proofs that is foundational in modern mathematics. The Elements has influenced the teaching and understanding of mathematics for centuries.
While his system of logic also had a profound impact, The Elements is particularly notable for its widespread influence on mathematical education and the development of geometry.