LOGIC STATEMENTS
If we have two logic statements that are related we can draw a
conclusion. You do this in mathematics often
eg 1.
A = 3
2.
B = 3
therefore,
A = B This is our conclusion.
Logic statements can be TRUE or FALSE. If our statements are true then
our conclusion is true.
You can use sentences instead of mathematics. If your statements are
false you can draw some very strange conclusions.
The examples below are from Lewis Carroll (Alice In Wonderland author).
You can fill in the blanks to make your own.
|
Carroll's |
Yours |
|
1. Bores are terrible. 2. You are a bore. \ You are terrible. |
1. ............. are terrible. 2. You are a .................. \ You are terrible. |
|
1. No bald creature needs a hairbrush. 2. No lizards have hair. \ Lizards
don't need a hairbrush. |
1. No bald creature needs a ...................... 2. No lizards have hair. \ Lizards don't need a ....................... |
|
1. John is in the house. 2. Everybody in the house is ill. \ John is
ill. |
1. John is in the house. 2. Everybody in the house is .................. \ John is
....................... |
|
1. No children are patient. 2. No impatient person can sit still. \ Children can't
sit still. |
1. No ...................... are patient. 2. No impatient person can sit still. \
....................... can't sit still. |
|
1. No old rabbits are greedy. 2. All black rabbits are greedy. \ No old
rabbits are black. |
1. No old rabbits are greedy. 2. All ..................... rabbits are greedy. \ No old
rabbits are ................. |
|
1. All ducks waddle. 2. Nothing that waddles is graceful. \ Ducks are
not graceful. |
1. All ......................... waddle. 2. Nothing that waddles is graceful. \
................... are not graceful. |
|
1. No quadrupeds can whistle. 2. Some cats are quadrupeds. \ Some cats
can't whistle. |
1. No .......................... can whistle. 2. Some cats are ......................... \ Some cats can't whistle. |
|
1. All cats understand French. 2. Some chickens are cats. \ Some
chickens understand French. |
1. All ................. understand French. 2. Some chickens are ..................... \ Some chickens understand French. |
|
1. "I saw it in a newspaper" 2. "All newspapers tell lies" \ It was a lie. |
1. "I heard it from ................." 2. "All ........................ tell lies" \ It was a
lie. |