https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13978120Edit ImageSaveSaveEditCropCustom TextA mathematician draws a semi-circle while Minerva watches over him. Engraving by R. Sadeler, 1591, after M. de Vos.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 940 px | 300 dpiLarge JPEG 3200 x 2506 px | 300 dpiFree DownloadA mathematician draws a semi-circle while Minerva watches over him. Engraving by R. Sadeler, 1591, after M. de Vos.More