Only girls are really smart in logic. So, Jenny, who is a girl, is very smart in logic. Counterexample?

Question

This is obviously an invalid argument in Philosophy terms. I'm looking for a counterexample for this problem. Best answer wins my vote.

Answer 1

? no boys are smart in logic,,, so Dan, who is a boy, is not smart in logic

Answer 2

This IS a valid argument, it simply isn't true. The form is:

All A are B (All girls are good logicians)
X is an A (Jenny is a girl)
Therefore, X is a B (Therefore, Jenny is a good logician)

Your expression is, thus, formally (logically) valid, it simply starts from an untrue premise, and is therefore untrue.

An example of the same form which is true is:

All men are mortal
Socrates is a man
Therefore, Socrates is mortal

Answer 3

The basic fallacy in this argument is that knowing that Jenny is a girl is necessary but not sufficient.
Your basic argument look like this

If x is not a G it is not S
J is a G
Therefore J is S.


To male it obvious think about the following example
Only Boys have penises
Jimmy is a boy
However, it does not follow that Jimmy has a penis(for example he could have lost it in a terrible tractor incident)

Thus it is necessary for Jimmy to be a boy to have a penis, but not sufficient,

Answer 4

It says only girls, not all girls.

Some girls however, are horrible in logic. So, Jenny, who is a girl, has a chance of being very smart in logic, although not assured.

Answer 5

Jenny taught her little brother everything she knows.

In logic a really smart girl
Taught her brother to give it a whirl.
He learned 'if z than y'
Til she sighed, why oh why
Tis enough to make toes curl

Answer 6

I am a boy and I am very logical. That's a counterexample.

Answer 7

Only girls are smart in logic.
Jenny is a girl.
Jenny is not smart in logic.
Thus, not all girls are smart in logic.

Answer 8

yes but not ALL girls are really smart in logic. so, there could be some subset of girls, who are smart and some subset of girls who are not smart in logic. they are two overlapping circles, ones who are smart in logic (all of whom are girls), and the other circle of girls, only some of whom overlap into the smart circle, others not included in the smart in logic subset.

for this argument to work, you would have to say all girls are really smart in logic, and only girls are really smart in logic.

Answer 9

Your question is flawed, therefore, your not Logical.
Here, have a cookie...

Answer 10

Yeah, but she's a GIRL.