10/18/19

04/13/19

#### patrotism and nationalism

So, my first question is: But can a dissident (someone who expresses their disagreement with their own country) be considered patriotic? So, second question: is this a valid argument... more

04/13/19

#### Is Newton's third law always correct?

Newton's third law states that every force has an equal and opposite reaction. But this doesn't seem like the case in the following scenario: For example, a person punches a wall and the wall... more

04/13/19

#### Are Newton's "laws" of motion laws or definitions of force and mass?

If you consider [them](http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion) as laws, then there must be independent definitions of [force](http://en.wikipedia.org/wiki/Force) and... more

04/13/19

#### If action equals reaction, how is it ever possible to win in martial arts?

In kick-boxing, when a fighter's leg hits an opponents leg, the outcome, based on Newton's 3rd law, should be the same for each fighter. It's not even important who kicked who, as in the moment of... more

04/13/19

#### Why do whips hurt so much?

What exactly is the mechanism that makes a whip deliver such a strong impact? Elasticity, torque, or pressure? Just hitting something with a plank doesn't deal nearly as much damage. What's the... more

03/21/19

#### Physics elevator question

An elevator has an upward acceleration of 3.2 m/s^2. How much does an occupant of mass 80 kg weigh in Newtons while riding in the elevator?

03/18/19

#### What is modal logic for?

I understand "pure" logic as a structural description of what a valid proof is but I have never understood the reasons for using modal logic. What's an example typical of how modal logic is used?

03/14/19

#### What is the difference between a statement and a proposition?

I'm doing a MOOC on mathematical philosophy and the lecturer drew a distinction between a proposition and a statement. This is very puzzling to me. My background is in math and I regard those two... more

03/14/19

#### What is the difference (if any) between "not true" and "false"?

A fairly simple question I hope someone can help me with.

03/14/19

#### Is circular reasoning always a fallacy?

Suppose the following dialogue: >... >"I accept only one notion of land property. Namely, 'I am doing my stuff here, therefore I am here". >"But this means," he responded, "you can break... more

03/14/19

#### Why do some people care so much about "empirical truth"?

Whenever you discuss philosophy, inevitably you will come across a type of person who holds empirical truth above all else, and will blatantly ridicule any discussion which has its onset in a... more

03/14/19

#### How can we reason about "if P then Q" or "P only if Q" statements in propositional logic?

When you have a propositional sentence of the form ***P* ⊃ *Q*** — which we might read as "if *P*, then *Q*" — how can you tell when it is true, or false, based on the truth-values of *P* and *Q*... more

03/13/19

#### Can an argument be valid even though one of its premises is false?

Is it possible for an argument to be valid by virtue of its logical form, but contain a false premise? In other words, can a premise be false even though the argument itself is logically valid?

03/13/19

#### Could 'cogito ergo sum' possibly be false?

I've heard it postulated by some people that *"we can't truly know anything"*. While that does seem to apply to the vast majority of things, I can't see how *'cogito ergo sum'* can possibly be... more

10/11/17

#### What does Hobbes believe is the true definition or state of leviathan?

Is this a logical state

03/23/17

Logic phil 60

09/27/16

#### How do I show that [p ? (q ? r)] = [p ^(¬r) ? (¬q)]

[p ⇒ (q ⇒ r)] = [p ^(¬r) ⇒ (¬q)]

09/06/16

#### Using Logical simplification

Could someone help me on the question below please.   Using Logical simplification, prove that the following are tautologies, contradictions or neither. Verify your answers using a truth... more

11/23/15

#### 1) ?P(c = b?P(c)) 2) ?x( f (b) = x)) (note: ? means backwards E)

Suppose we have an FOL with names/constants a,b,c,d, variables x,y, z, function symbolsf (x),g(x),h(x,y), predicate symbols P(x),Q(x),R(x,y),x = y, the usual connectives and the quantifiers∀,∃. For... more
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