Reviews of Films
Mathematics Teacher Learning and Teaching PK-12 · 1970
In developing the idea of intersection, the meanings of set, member of a set, subset, and null or empty set are discussed. These ideas are first related to a baseball team and the specta tors in the bleachers. As the film progresses, the principles are discussed in relation to numerals, points on the number line, and the diagrams illustrating these ideas. Venn diagrams are in troduced early and used generously throughout the film. The symbols for subset, intersection, and null set are also used.