38 Answered Questions for the topic Set Theory

10/21/20

Set Theory and Lists

If A = {b, {b}, ∅} how would we use list notation to write {B: B ⊆ A and B ≠ ∅} If you could explain what I need to do to solve this that would be much appreciated.
Set Theory Calculus

05/13/19

Set Theory Question

Prove f(a1∩f^-1(b2)=f(a1)∩b2
Set Theory Algebra 2 Inequalities

05/01/19

Problem on two variable polynomial inequalities (Probably a diophantine inequality !!)

Consider the sets defined by the real solutions of the inequalities :A = { ( x , y ) : x2 + y4 ≤ 1} B = { ( x , y ) : x4 + y6 ≤ 1}Then... more

03/18/19

What are ways to use the palindromic property of a palindromic scale?

A palindromic scale, as I've seen it described on a number of music theory websites, is defined as one whose sequence of intervals is the same when ascending and descending. For instance: D Dorian... more
Set Theory

11/28/18

About continuum hypothesis

Sir why continuum hypothesis isn't falsifiable. It states that "There is no set whose cardinality is strictly between that of the integers and the real numbers"; so can't we make a set which... more
Set Theory

10/01/18

State the number of elements in the set, if possible

A={×:×∈Ζ, -6<×≤4}

09/10/18

Bernard's Cars Problem (algebra) - Please help me with this problem.

Bernard, who is a genius and very wealthy, owns one thousand cars, each of which is numbered with a different natural number from 1 to 1000. He invites 1000 people to a party, and he makes each... more
Set Theory Discrete Math

06/30/18

Set builder notation translation and cardinality

Given the following:S = {(A, B) | A ⊆ {1, 2, . . . , n}, B ⊆ {1, 2, . . . , n}, |A ∩ B| ≥ 1}, how can I translate this in terms of english and how would one go about finding the cardinality of the... more
Set Theory Sets

06/25/18

If A and B are subsets of the universal set U , then show that

A⊂B⇔A∪B=B , without the use of Venn-Euler diagram.
Set Theory

04/28/18

on set theory

Every resident of a city can speak Hindi or English. If 75 % of the population speaks Hindi and 60% speaks English, then what percentage can speak both the languages ?
Set Theory Math Logic Proofs

01/25/18

Set Theory/Math Logic

Is there any way to prove that   - Every point in A intersect B is greater than or equal to 1?   - The intersection of two sets has a point in commonwith another set?   If there is no way to... more

01/08/18

Define two functions c(x) = max{x - a,0}, p(x) = max{a-x,0}. Prove that c(x) - p(x) = x - a

Define two functions c(x) = max{x - a,0}, p(x) = max{a-x,0}. Prove that c(x) - p(x) = x - a

01/08/18

Let X: [0,1] being in all real numbers be given by X(x) = max{x-0.5,0}. Find the inverse images of all intervals [a,b]

Let X: [0,1] being in all real numbers be given by X(x) = max{x-0.5,0}. Find the inverse images of all intervals [a,b] Due to lack of examples related to the theory, I am unable to properly write... more
Set Theory

12/23/17

J={x|x 4 - 2x is less than equal to 10 ^ x € z}

Convert it into roster form. 
Set Theory Math Proofs

11/20/17

I need help with writing a proof about cardinality. Please look at description for more detail.

Let N^N(Nautral Numbers)={f:f|N->N}.   a. Give two elements of N^N   b. Prove that Aleph Zero <|N^N|
Set Theory

06/28/17

Venn diagram word problem

A survey of 100 school children was taken to determine how they liked their ice cream. It was found that: 55 like vanilla,90 liked at least one of the flavors 50 do not like chocolate,35 liked... more
Set Theory Natural Numbers

04/20/17

Dont understand natural number+ symbol. what does it mean

I know and understand what natural numbers are, but what does it mean when the natural number symbol has a + at the top, in the position the squared number would be. Can't seem to find information... more
Set Theory

03/21/17

Of 540 students, 335 like hamburgers and 287 like hotdogs. 220 like both.

1. How many students don't like either? 2. ~hamburgers=
Set Theory

03/21/17

In a survey 113 business executives were asked if they regularly read the Wall Street Journal, Business Week, and Tampa Bay Times.

87 read Journal, 74 read Business, 88 read Times, 56 read Journal and Business, 55 read Business and Times, 67 read Journal and Times, 42 read all 3. 1. How many read only the Wall Street... more
Set Theory Math Discrete Math Sets

01/27/17

Discrete Math / Set Theory - Proof

Hi I have 2 problems that I need to say whether or not they are true or not and then write a proof for my answer. I am really struggling and could use a little help thank you   1)        (X ⊆ Y... more
Set Theory

01/18/17

Is it possible to find different combinations of subsets which cover the original set?

for example if A = {a,b,c} then all possible subsets are {a}, {b}, {c}, {a,b}, {a,c}, {b,c},{a,b,c} and combinations of subsets which cover the original set are: {{a},{b,c}} and {{a},{b},{c}} and... more

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