INTRODUÇÃO
https://www.youtube.com/watch?v=0aUEDxYjZg8
UNIÃO
https://www.youtube.com/watch?v=YrvvKx3HtPA
INTERSEÇÃO
https://www.youtube.com/watch?v=4F5mL-sznsY
DIFERENÇA E COMPLEMENTAR
https://www.youtube.com/watch?v=uAgjOoH_LkU
PROBLEMAS ENVOLVENDO DIAGRAMAS - "BOOOOFY THEORY"
https://www.youtube.com/watch?v=uGIVFd6SQKI
INTERVALOS REAIS
https://www.youtube.com/watch?v=p4Ez-lxLzwU
OPERAÇÕES COM INTERVALOS REAIS
https://www.youtube.com/watch?v=fy7myo_vhcg