search
Log In
Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true

Web Page

Syllabus: Sets, Relations, Functions, Partial orders, Lattices, Groups.

$$\small{\overset{{\large{\textbf{Mark Distribution in Previous GATE}}}}{\begin{array}{|c|c|c|c|c|c|c|c|}\hline
\textbf{Year}&\textbf{2019}&\textbf{2018}&\textbf{2017-1}&\textbf{2017-2}&\textbf{2016-1}&\textbf{2016-2}&\textbf{Minimum}&\textbf{Average}&\textbf{Maximum}
\\\hline\textbf{1 Mark Count}&1&1&0&2&0&0&0&0.7&2
\\\hline\textbf{2 Marks Count}&0&1&1&0&1&2&0&0.8&2
\\\hline\textbf{Total Marks}&1&3&2&2&2&4&\bf{1}&\bf{2.3}&\bf{4}\\\hline
\end{array}}}$$

Recent questions in Set Theory & Algebra

2 votes
2 answers
1
Consider the following sets, where $n \geq 2$: $S_1$: Set of all $n \times n$ matrices with entries from the set $\{ a, b, c\}$ $S_2$: Set of all functions from the set $\{0,1,2, \dots, n^2-1\}$ to the set $\{0, 1, 2\}$ Which of the following ... to $S_2$ There exists a surjection from $S_1$ to $S_2$ There exists a bijection from $S_1$ to $S_2$ There does not exist an injection from $S_1$ to $S_2$
asked Feb 18 in Set Theory & Algebra Arjun 570 views
1 vote
1 answer
2
For two $n$-dimensional real vectors $P$ and $Q$, the operation $s(P,Q)$ is defined as follows: $s(P,Q) = \displaystyle \sum_{i=1}^n (P[i] \cdot Q[i])$ Let $\mathcal{L}$ be a set of $10$-dimensional non-zero real vectors such that for every pair of distinct vectors $P,Q \in \mathcal{L}$, $s(P,Q)=0$. What is the maximum cardinality possible for the set $\mathcal{L}$? $9$ $10$ $11$ $100$
asked Feb 18 in Set Theory & Algebra Arjun 354 views
2 votes
2 answers
3
Let $G$ be a group of order $6$, and $H$ be a subgroup of $G$ such that $1<|H|<6$. Which one of the following options is correct? Both $G$ and $H$ are always cyclic $G$ may not be cyclic, but $H$ is always cyclic $G$ is always cyclic, but $H$ may not be cyclic Both $G$ and $H$ may not be cyclic
asked Feb 18 in Set Theory & Algebra Arjun 369 views
2 votes
4 answers
4
A relation $R$ is said to be circular if $aRb$ and $bRc$ together imply $cRa$. Which of the following options is/are correct? If a relation $S$ is reflexive and symmetric, then $S$ is an equivalence relation. If a relation $S$ is circular and symmetric, ... and circular, then $S$ is an equivalence relation. If a relation $S$ is transitive and circular, then $S$ is an equivalence relation.
asked Feb 18 in Set Theory & Algebra Arjun 509 views
1 vote
3 answers
5
The number of positive integers not exceeding $100$ that are either odd or the square of an integer is _______ $63$ $59$ $55$ $50$
asked Nov 20, 2020 in Set Theory & Algebra jothee 515 views
0 votes
2 answers
6
Show that if $S$ is a set, then there does not exist an onto function $f$ from $S$ to $P(S),$ the power set of $S$. Conclude that $\mid S\mid < \mid P(S)\mid .$ This result is known as Cantor’s theorem. [Hint: Suppose such a function $f$ existed. Let $T = \{s \in S \mid s \notin f (s)\}$ and show that no element $s$ can exist for which $f (s) = T.]$
asked Apr 21, 2020 in Set Theory & Algebra Lakshman Patel RJIT 167 views
0 votes
0 answers
7
0 votes
1 answer
8
Show that the set of functions from the positive integers to the set $\{0, 1, 2, 3, 4, 5, 6, 7, 8, 9\}$ is uncountable. [Hint: First set up a one-to-one correspondence between the set of real numbers between $0$ and $1$ and a subset of these functions. Do this by associating to the real number $0.\:d_{1}d_{2} \dots d_{n}\dots $ the function $f$ with $f (n) = dn.]$
asked Apr 21, 2020 in Set Theory & Algebra Lakshman Patel RJIT 134 views
0 votes
0 answers
9
Show that the set of all computer programs in a particular programming language is countable. [Hint: A computer program written in a programming language can be thought of as a string of symbols from a finite alphabet.]
asked Apr 21, 2020 in Set Theory & Algebra Lakshman Patel RJIT 52 views
0 votes
0 answers
10
Show that there is a one-to-one correspondence from the set of subsets of the positive integers to the set real numbers between $0$ and $1$. Use this result and question $34$ and $35$ to conclude that $ℵ_{0} < \mid P(Z^{+})\mid =\mid R\mid.\:[$Hint: Look at the first part of the hint for Exercise $35.]$
asked Apr 21, 2020 in Set Theory & Algebra Lakshman Patel RJIT 43 views
0 votes
0 answers
11
Show that there is no one-to-one correspondence from the set of positive integers to the power set of the set of positive integers. [Hint: Assume that there is such a one-to-one correspondence. Represent a subset of the set of positive integers as an infinite bit string with ... complement of the $ith$ bit of the $ith$ string in the list. Show that this new bit string cannot appear in the list.]
asked Apr 21, 2020 in Set Theory & Algebra Lakshman Patel RJIT 38 views
0 votes
0 answers
14
Show that when you substitute $(3n + 1)^{2}$ for each occurrence of $n$ and $(3m + 1)^{2}$ for each occurrence of m in the right-hand side of the formula for the function $f (m, n)$ in question $31,$ you obtain a one-to-one polynomial function $Z \times Z \rightarrow Z.$ It is an open question whether there is a one-to-one polynomial function $Q \times Q \rightarrow Q.$
asked Apr 21, 2020 in Set Theory & Algebra Lakshman Patel RJIT 24 views
0 votes
0 answers
15
0 votes
0 answers
20
Use question $25$ to provide a proof different from that in the text that the set of rational numbers is countable. [Hint: Show that you can express a rational number as a string of digits with a slash and possibly a minus sign.]
asked Apr 21, 2020 in Set Theory & Algebra Lakshman Patel RJIT 33 views
...