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Lesson: Law of Syllogism
Contributed by: Pappal
There are two laws dealing
There are two laws dealing
with conditional statements.
There are two laws dealing
Law of Detachment
with conditional statements.
There are two laws dealing
Law of Detachment
with conditional statements.
and
There are two laws dealing
Law of Detachment
with conditional statements.
Law of Syllogism
and
Let's look at the Law of Syllogism
Let's look at the Law of Syllogism
You will be given 
Let's look at the Law of Syllogism
You will be given 
two conditional statements:
Let's look at the Law of Syllogism
If it is a pelican, then it is a bird.
You will be given 
two conditional statements:
Let's look at the Law of Syllogism
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
You will be given 
two conditional statements:
Let's look at the Law of Syllogism
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
You will be given 
two conditional statements:
Two conditional statements
If you drink, then you will feel better.
If you are thirsty, then you should drink.
Are these two sentences conditional statements?
Yes
No
Henry is thirsty.
If you are thirsty, then you should drink.
Are these two sentences conditional statements?
Yes
No
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Identify the hypotheses and conclusions.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Identify the hypotheses and conclusions.
conclusions
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Identify the hypotheses and conclusions.
hypothesis
If you are a person, then you have feelings.
hypothesis
?
conclusion
?
If you like salt, then you should eat pretzels.
hypothesis
?
conclusion
?
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
this conclusion
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
matches this
hypothesis
this conclusion
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
Then you what is left over to write an answer.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
Then you what is left over to write an answer.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
Then you what is left over to write an answer.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
Then you what is left over to write an answer.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
If it is a pelican
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
Then you what is left over to write an answer.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
If it is a pelican then it has a beak.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
Then you what is left over to write an answer.
If it is a bird, then it has a beak.
If it is a pelican, then it is a bird.
If it is a pelican then it has a beak.
Look for a conclusion and hypthesis that match.
Cross out the matching pair.
answer
If it swims, then it has fins.
If it is a fish, then it swims.
Which part should be crossed out?
it is a fish
it swims
it has fins
If a place if warm, then it is cozy.
If a place is comfortable, then it is warm.
If
then
.
Sometimes there will be
Sometimes there will be
no conclusion
Sometimes there will be
If you are a bird, then you have wings.
no conclusion
Sometimes there will be
If you are a bird, then you have a beak.
If you are a bird, then you have wings.
no conclusion
Sometimes there will be
If you are a bird, then you have a beak.
If you are a bird, then you have wings.
no conclusion
The matching ones are both hypotheses.
Sometimes there will be
If you are a bird, then you have a beak.
If you are a bird, then you have wings.
no conclusion
The matching ones are both hypotheses.
Sometimes there will be
If you are a bird, then you have a beak.
If you are a bird, then you have wings.
no conclusion
The matching ones are both hypotheses.
Sometimes there will be
If you are a bird, then you have a beak.
If you are a bird, then you have wings.
no conclusion
The matching ones are both hypotheses.
both hypothesis'
Sometimes there will be
If you are a bird, then you have a beak.
If you are a bird, then you have wings.
So your answer is:
no conclusion
The matching ones are both hypotheses.
Sometimes there will be
If you are a bird, then you have a beak.
If you are a bird, then you have wings.
So your answer is:
no conclusion
The matching ones are both hypotheses.
no conclusion
If you ride a bike, then you are talented.
If you ride a bike, then you are coordinated.
Can you make a conclusion?
Yes
No
If you shiver, then you may drop something.
If you are cold, then you will shiver.
Can you make a conclusion?
Yes
No
If
If you shiver, then you may drop something.
If you are cold, then you will shiver.
Can you make a conclusion?
Yes
No
then
.
If you are a gymnast, then you are coordinated.
If you ride a bike, then you are coordinated.
Can you make a conclusion?
Yes
No
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