Who are Dave and frank in alas Babylon?

In "Alas, Babylon" by Pat Frank, Dave and Frank are two characters who represent contrasting attitudes toward the post-apocalyptic world. Dave is a pragmatic Survivor who adapts to the harsh realities following the nuclear disaster, while Frank, a more idealistic character, struggles to cope with the new circumstances. Their interactions highlight themes of resilience and the human spirit in the face of catastrophe.