Needed and enough

Something is needed (a necessary condition) when the result can't happen without it, and enough (a sufficient condition) when it makes the result sure. Air is needed for a fire, but not enough.

Depth 1 · Foundation

You can tell whether something is needed, enough, both or neither for a result, and say each as an if-then claim.

Depths of understanding

1
Foundation
You can tell whether something is needed, enough, both or neither for a result, and say each as an if-then claim.
Opens after
Conditional statements"Needed" and "enough" are two ways an if-then link can run.

Your path here

What's still between you and Needed and enough, depth 1, in the order you can learn it.

Builds on

Conditional statements"Needed" and "enough" are two ways an if-then link can run.

Opens up

Only if and unless"Only if" names something needed, and "if and only if" something both needed and enough.