Union
$$A \cup B =$$
{ application, audio, concrete operational, example, font, formal operational, image, message, model, multipart, pre-operational, sensorimotor, text, video }
Symmetric Difference
$$A \ominus B =$$
{ application, audio, concrete operational, example, font, formal operational, image, message, model, multipart, pre-operational, sensorimotor, text, video }
Cartesian Product
$$A \times B =$$
{ (application, concrete operational),
(application, formal operational),
(application, pre-operational),
(application, sensorimotor),
(audio, concrete operational),
(audio, formal operational),
(audio, pre-operational),
(audio, sensorimotor),
(example, concrete operational),
(example, formal operational),
(example, pre-operational),
(example, sensorimotor),
(font, concrete operational),
(font, formal operational),
(font, pre-operational),
(font, sensorimotor),
(image, concrete operational),
(image, formal operational),
(image, pre-operational),
(image, sensorimotor),
(message, concrete operational),
(message, formal operational),
(message, pre-operational),
(message, sensorimotor),
(model, concrete operational),
(model, formal operational),
(model, pre-operational),
(model, sensorimotor),
(multipart, concrete operational),
(multipart, formal operational),
(multipart, pre-operational),
(multipart, sensorimotor),
(text, concrete operational),
(text, formal operational),
(text, pre-operational),
(text, sensorimotor),
(video, concrete operational),
(video, formal operational),
(video, pre-operational),
(video, sensorimotor) }
Media type