This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Henri Poincar Signature.svg en Henri Poincar's signature Traced in Adobe Illustrator from File Henri Poincar's signature Henri Poincar PDOld Henri Poincar Signatures of philosophers
Page 2023 Free-images.com. All images are Public Domain