# All Questions

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79 views

### Fitch Proof - Logic LPL 6.31

I am trying to complete the following proof in Fitch but am completely clueless on how to approach it. Any help would be appreciated! Thanks
70 views

### What is the definition of 'object' in philosophy?

I have two examples in my mind that I'm unsure if they can be considered Objects: The second usage of things, as in, each thing has usually a defined usage, but sometimes people use things in a ...
32 views

### De Morgan's Law Formal Proof [duplicate]

Does anyone know how to do this without the use of addition rules? We have not covered that in class, and all the info I can find online suggests that as a solution. Thanks]1
113 views

### What's the simplest thing?

If we imagine the world and what surrounds us as concepts, if you then had to explain these ideas (i.e. What's a person? What's an animal? What's a living being? ...) you'd then need to recursively ...
32 views

### How can a undecidable theory be complete?

I don't understand how a theory can be undecidable (there is no effective procedure for determining if a sentence of the language is a theorem) and also be complete. How do we know all sentences are ...
35 views

### Subjective idealism of Berkeley and Social reality

If one were to accept immaterialist position that Berkeley takes. how can it explain social reality? From what I understand, Berkeley does not deny existence of physical objects, he says that ...
116 views

### Are some expressions such as 'In my opinion', 'I think', 'In my view' philosophical?

All of us went through some periods where he philosophized. When we philosophise, we use normally, and naturally, expressions like: In my opinion, In my point of view, I think, I propose, I suppose ...
153 views

### Is the laughable person beautiful?

All of us when see a laughable comedy star, for example: a fatty actor having a laughable face, i.e: physically laughable whose appearance makes us smile or laugh, we feel happiness and joy. Does this ...
987 views

### Is fascism intrinsically violent?

Has every group or nation that is generally considered to be fascist, descended from the nationalist ideology of Mussolini (I don't mean 'fascism' in the sense of just any right wing demagogy), ...
105 views

### Is there a philospher who thinks that there is a Thing, we call it [Thing], which is Infinite? [closed]

Suppose that any thing to be a thing it must be finite, so Godhood and Godhead must be finite. Life only is the infinite. Life=flowing and becoming of Things. So, Things are Finite, but flowing of ...
71 views

### Is there any philosopher who think that this cycle of creation is very new, Just few hundreds of years, or just few generations? [closed]

In my contemplation, and checking the history, I noticed that: mythology and mythological figures come before 550 B.c., this means that the cycle of creation may started around 500 B.c. For some ...
54 views

### Do questions of Infinite regress, uncased cause and nothingness just point to our limits?

A lot of debates and conversations with theists seem to end up with the "ultimate" questions where the questions themselves seem to me to be conceptual/linguistic/psychological dead ends. Infinite ...
114 views

### Is fascist Ideology purely negative? [closed]

Is fascism a set of purely negative, instrumental things such as dictatorship and Nationalism that are means to an end rather than having end in itself (besides "lower taxes" (???)) ? Or are their ...
66 views

### Is Herbrand semantics a kind of term formalism?

Michael Genesereth and Eric Kao describe Herbrand semantics as follows: Herbrand semantics is an alternative semantics for First Order Logic based on truth assignments for ground sentences rather ...
292 views

### Rationalism and Catholicism / Protestantism

How much more “incompatible” was rationalism with Catholicism compared to Protestant christianity? Of course everyone learned in high school that the enlightenment was in direct opposition to ...
38 views

### Why doesn't one assert in metamathematics that a sentence S is a logical consequence of the conjunction of a set of sentences?

In other words, why isn't there -- at least in standard textbook presentations of things like the deduction theorem and the compactness theorem -- a conjunction connective that is applied to sets of ...
31 views

### Is it good to have a society where people care about people and live there? [closed]

I am thinking of choosing where to live in the long term, depending on whether people care about other people. Is such a society good, and is such a way of choosing where to live a good choice? For ...
75 views

### How do liberals escape hyperreality [closed]

Do they accept. Or do they become annihlated. Or annihlate each other. Or go even further than that.
25 views

### Ramifications of a world of unrestrained truth [duplicate]

Are there any papers/books/studies on the ramifications of a theoretical world of unrestrained truth, meaning no secrets? A part of the motivation for this question is the fictional show, Code Geass, ...
189 views

### Did early Wittgenstein view mathematics as “sense-less” or “non-sensical”?

G. E. M Anscombe makes the following distinction between Wittgenstein's use of sense-less (sinnlos) and nonsense (unsinnig): (page 163) We must distinguish in the theory of the Tractatus between ...
169 views

### Although Russell's paradox has the virtue of simplicity, is it a distraction from other paradoxes of naive set theory?

Given that Russell's paradox exhibits a contradiction in naive set theory, the interpretation of the binary relation "∈" called "membership" (where the expression "x ∈ m" is pronounced as "x is an ...
95 views

### Is phenomenology a science?

Is phenomenology a science? I know Husserl was fond of saying it is. Specifically, is any of it scientific? By "phenomenology" I mean the study of structures of consciousness as experienced from ...
42 views

### Does anyone discuss 'limit' in Wittgenstein?

Does anyone discuss 'limit' in Wittgenstein? The word "limit" keeps appearing in the Tractatus: of thinking; of language; of the world; of the natural sciences; of my visual field. It's used even more ...
33 views

### Contrapositive Fitch Proof

I can't seem to figure out how to get past this step. Any suggestions?
25 views

### Why jain philosophy denies indeterminate stage of perception?

Ok ,so I'm reading now Indian philosophy and I found that Buddhism and many other Indian philosophy recognise both ' determinate and indeterminate stage of perception ' while jainas don't !
123 views

### To connect or to disconnect mathematics and platonism?

How [do philosophers] strongly support or refute the view that: mathematics is a bag of tricks for real-world problem solving; undecidable statements are an irrelevant and harmless side-effect of an ...
67 views

### Complement of “at least two people share the same birthday”

Suppose a room contains 𝑛 people. What is the probability that at least two people share the same birthday? So this is actually a question on probability, but I'm really confused in the logic and ...
24 views

### If only the present is ideal in McTaggart's sense are we still obliged to accept his C-series or something close to it?

If only the present in the A series is ideal in McTaggert's sense are we still obliged into accepting his C-series or something close to it, in order to account for the appearance of change? It seems ...
99 views

### Why are referring and predicating distinct from illocutionary acts?

I have been reading Searle's Speech Acts and he mentioned that in the four sentences mentioned below, while they share the same reference (Sam) and predication (smoking habitually), they are four ...
148 views

### Was Bertrand Russell correct in characterising the United States as 'a Nazi State'? [closed]

In his book, War Crimes in Vietnam, published in 1967 Russell several times calls the United States a Nazi State: The United States government is conducting a war of annihilation in the Vietnam. ...
77 views

### Is every reason reducible to a sequence of tautological statements? [closed]

I think of tautological statements as those statements which when explained should repeat themselves, and should intuitively explain the reason. For example, A = A because 'A is equal to A'; Dog is ...
90 views

### Is this quote flawed when it comes to not understanding racism and also not admiring it? [closed]

Can anyone please help me with how to respond to someone who has told me that he doesn't understand racism and can't admire it either? Is it possible that someone doesn't get what racism is? Here is ...
207 views

### What philosophical axes did 19th century mathematicians have to grind?

Tim Button's presentation of set theory motivates the subject by providing a history of 19th century mathematics where the notion of limit allowed definitions of the derivative and continuity. These ...
84 views

### Do Aristotle's three laws of logic apply to statements about the future?

I have just read about Aristotle's Three Laws of Logic. I was wondering if statements such as "There is a chance of it raining in the next hour" can be evaluated using the three laws. Can you apply ...
76 views

### Henry George vs. Karl Marx

I recently came across some of Marx's critique of Georgism, and was wondering where else the theories of these two thinkers conflict. Georgism to me certainly seems to have a slight materialist bent ...
24 views

### Logic Question in a fitch style system - disjunction elimination

I am having difficulty in formally proving two arguments. Firstly, given the premises A ∨ (B∧C) ¬B∨¬C∨ D derive A v D. I can see why it has to be either A or D, because if it's B and C, ...
278 views

### Proof Using Model Universe

Suppose I am trying to prove the following argument (∀x)(Cx → Dx), (∀x)(Ex → ~Dx), /∴ (∀x)(Ex → ~Cx) Now, let's also assume that I don't know if this argument is valid or not. Because of this, I try ...
6k views

### What do you call the fallacy of thinking that some action A will guarantee some outcome B, when in reality B depends on multiple other conditions?

Example: Dentist: “You have multiple cavities.” Patient: “That’s ridiculous! You always told me that brushing my teeth prevents cavities. I brush my teeth every night. Therefore, I can’t possibly ...
102 views

### Difference between “neither true nor false” and “either true or false.”

What is the difference between "neither true nor false" and "either true or false."? I was reading about definitions And I read a line saying "Lexical definitions are either true or false". After ...
50 views

### Human relations for the future

If the future had lesser jobs for humans at all would (seems to head that way now like AI,partial self reliance vacuum cleaner, smart car) the world be undoing what it just done?What do I mean?For a ...
60 views

### What would you do? [closed]

To give some background, I'm trained in biology (UCSC) and seem to have a knack for it. My success with software probably gives credibility to my ability with simple logic. I've worked on a long term ...
57 views

### Clarification on what is and isn't a logical statement

After reading the article from Wikipedia I feel more confused on what the scope of the definition of a 'logical statement' or proposition is. First, is the statement "It is raining" considered to be ...
43 views

### What is the difference between a function and a relation in first-order logic?

Consider this definition of first-order (or Herbrand) logic syntax. Here is the vocabulary: Definition (Vocabulary): A vocabulary V consists of: A set of relation constants {r1, ...,...
39 views

### Difference between the ensemble of organizations in an anarchy and a state?

Even an anarchy needs organizations to provide security, legal judgment, roads, etc. and to prepare large-scale plans and arrangements. Probably, for the sake of efficiency and harmony, there should ...
43 views

### The perfect definition of impossible [closed]

When i think about the true impossible, for me is a very dark area, that causes depression, because when we think about this simple question that begins whit, an example, "God creates the Human ...
192 views

### Is space experienced?

Space doesn't have a taste, a smell, a sound or a "shape". Anything we experience and think seem to require it. It doesn't have any experiential property whatsoever, but we still normally refer to it ...
67 views

### What's the difference between a second-order relation and a relation between objects?

I was reading an article in philosophy and found this: Some philosophers have denied that there is such a relation as identity. Thus Ludwig Wittgenstein writes (Tractatus 5.5301): "That ...
76 views

### How should one symbolize “and then” in logic?

Graham Priest observed that not all uses of "and" in English commute: (page 15) ...according to the truth table for &, 'a and b' always has the same value as 'b and a', namely, they are both ...