31 Answered Questions for the topic Set Theory

05/31/19

05/13/19

Set Theory Question

Prove f(a1∩f^-1(b2)=f(a1)∩b2

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

04/14/19

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

10/01/18

State the number of elements in the set, if possible

A={×:×∈Ζ, -6<×≤4}

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

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.

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 ?

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

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

12/23/17

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

Convert it into roster form.

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

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

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=

03/21/17

01/28/17

U = {1,2,3,4,5,6,7,8,9} A={1,3,5,7,9} B= {1,2,3,4,5} C = {1,2,5,8,9} what is AUB' = . and what does A'n C = and what is A U A'

how do i solve this

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

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

12/12/16

What is the set of northeastern states NE ?

thats pretty much it

12/12/16

Think about R the set of real numbers. Are there any exceptions for any of its subsets being uncountable? If they exist, what are they?

Professor says this question is a lot simpler than I think

12/12/16

set theory

12/12/16

Let's say you have your email has a set total of 315 total messages how many subsets can you possibly create

This is a set theory problem my teacher say its easier than I think but I don't understand.

11/29/16

principal ideal ring

Suppose thatR=R1⊕R2⊕…….⊕Rnwhere each Ri is a principal ideal ring. Verify that R is also a principal ideal ring.   please I want help with that

09/06/16

Let A and B be subsets of U, n(U) = 100, n(A union B)' = 37, n(B-A)=40. Find n(A).

I can't find an example of how to solve when n(A) and n(B) are not given. Please help.

08/24/16

i have deficulty with this three questions that I need to solve and really need help as soon as possible

Let U={w, x, y,1, 2, 3} , A ={2, y} , B = {x, y, 3}, C ={w, y,1}   Find AU B' Find n(B-A)  find AXB
1

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