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:
Square of opposition set diagrams.svg Square of opposition In the Venn diagrams black areas tell that the area is empty and red areas tell that there is at least one element Faded red areas and fades arrows apply only in classical logic where only Can be printed as part of File Syllogism diagrams pdf Square of opposition Johnston