Bongard Problem with solution relating to concept: multiplicative product vs. Bongard Problem unrelated to this concept.
Bongard Problem with solution relating to concept: multiplicative product (arithmetic) vs. Bongard Problem unrelated to this concept.
Leo Crabbe
Bongard Problems with world circle, triangle, and square-ish outlines not allowed to nest/intersect vs. other Bongard Problems
Aaron David Fairbanks