why is causality a chain? why is logic made up of steps?

causality as a chain

hume questioned the necessity of causal connection, saw it as a habit of mind

x causes y if, had x not happened, y wouldn’t have happened

rooted in possible worlds logic

judea pearl uses directed acyclic graphs explicitly

logic made up of steps

frege / bertrand russell / Whitehead, formal logic as stepwise derivation

ludwig wittgenstein logical form as mirrored in the structure of reality, atomic facts compose into more complex facts

brouwer in intuitionism, logic is a constructive mental activity, the steps come from the “mind’s unfolding”