This page details examples of the use of logic in people’s daily lives.
For inferring about causation:
If the stove makes a sound soon, then the water in it has boiled.
The stove has made a sound.
Therefore, the water in it has boiled.
For confirmation and falsification:
If it has recently rained, then the ground is wet.
The ground isn’t wet.
Therefore, it hasn’t recently rained.
Either the item is in Box A or it is in Box B.
It isn’t in Box B
Therefore, it is in Box A
It is not that John didn’t go.
Therefore, John did go.
If Jane went out, then she went to the store.
If she went to the store, then she purchased something.
Therefore, if Jane went out, then she purchased something.
It is currently nighttime and it is currently raining outside.
Therefore, it is currently raining outside.
If the switch was flipped, the light was on.
Therefore, either the switch hasn’t been flipped or the light was on, or both (in this case, the light was turned on via other means)
John didn’t take both item A and B.
Therefore, either he didn’t take A or he didn’t take B, or both.
Jane take neither item A nor does she take item B.
Therefore, she didn’t take A and she didn’t take B.
Everything that is a human is also mortal (possible to die)
Therefore, if something is a human then that thing is also mortal.
Jane is a human.
Therefore, there is an individual that is a human.
Everything that is a human is also mortal.
John is a human
Therefore, John is mortal
Every room in this building has been labelled as occupied.
Everything labelled as occupied contains at least one person in it.
Therefore, every room in this hotel has at least one person in it.