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.
Keywords from Image Description:
LimSup. Made by myself with matlab LimSup svg Source code MATLAB function main draw an illustration for limit superior and limit inferior prepare the screen and define some parameters clf hold on axis equal axis off fontsize thickline thinline black red blue arrowsize arrowtype arrowangle angle in degrees circrad