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Undergraduate
By
Shiva Kintali
on June 13, 2012 | Updated Dec. 6, 2017
Basics of Pigeonhole Principle
Prove the following : Given \(n\) integers, some nonempty subset of them has sum divisible by \(n\). Let \(A\) be a set of \(n+1\) integers from {\({1, 2,\dots , 2n}\)}. Prove that some element of \…
Mathematics
Discrete Mathematics
basics
counting
pigeonhole principle
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High School
By
True IITJEE
on Jan. 16, 2017 | Updated Jan. 3, 2018
JEE Advanced 2016 Paper 1 Mathematics Question 49
Let RS be the diameter of the circle \(x^2 + y^2 = 1\), where S is the point \((1,0)\). Let P be a variable point (other than R and S) on the circle and tangents to the circle at S and P meet at the p…
Mathematics
Geometry
Trigonometry
jee
jee 2016
jee advanced
jee mathematics
locus
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tangent
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High School
By
Shiva Kintali
on May 19, 2013 | Updated Dec. 6, 2017
Basics of counting
Let \(S = {1,2,...,n}\). How many ordered pairs \((A,B)\) of subsets of \(S\) are there that satisfy \(A \subseteq B\) ?
Mathematics
Combinatorics
basics
counting
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Undergraduate
By
Shiva Kintali
on May 19, 2013 | Updated Dec. 6, 2017
Basics of countability
Prove that every collection of disjoint intervals (of positive length) on the real line is countable.
Mathematics
Real Analysis
basics
counting
0
Undergraduate
By
Shiva Kintali
on May 19, 2013 | Updated Dec. 6, 2017
Basics of decidability
State whether each of the following statements are TRUE or FALSE. Your answers should be accompanied by a proof. Every recognizable set has a decidable subset. Any subset of a recognizable language …
Computer Science
Complexity Theory
basics
true or false
undecidability
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Graduate
By
Shiva Kintali
on June 9, 2012 | Updated Dec. 6, 2017
Basics of Pfaffians
Let \(G(V,E)\) be an undirected graph. An orientation of \(G\) is Pfaffian if every even cycle \(C\) such that \(G \setminus V(C)\) has a perfect matching, has an odd number of edges directed in eithe…
Mathematics
Graph Theory
basics
pfaffian
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High School
By
Shiva Kintali
on Sept. 28, 2013 | Updated Jan. 4, 2018
Limits sine cosine tangent
Evaluate the following limits : \(\lim_{x \to 0} {\frac{\sqrt{1+{\sin}^2x^2}-{\cos}^3x^2}{x^3{\tan}x}}\)
Mathematics
Calculus
cosine
limits
sine
tangent
0
Undergraduate
By
Shiva Kintali
on Sept. 28, 2013 | Updated Jan. 4, 2018
Basics of Expectation and Variance
If the random variable \(X\) takes values in non-negative integers, prove that: \(E[X] = \sum_{t=0}^\infty \Pr(X > t)\) Prove that if \(X_1\) and \(X_2\) are independent random variables then …
Mathematics
Probability
basics
expectation
variance
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Undergraduate
By
Shiva Kintali
on May 19, 2013 | Updated Dec. 6, 2017
Basics of Connectivity
Prove that a connected graph \(G\) with \(2k\) odd vertices (odd degree vertices) decomposes into \(k\) paths (not necessarily simple paths) if \(k > 0\). Does this remain true if \(G\) is not connec…
Mathematics
Graph Theory
basics
connectivity
0
Graduate
By
Shiva Kintali
on June 10, 2012 | Updated Dec. 6, 2017
Basics of Treewidth
Treewidth of an undirected graph \(G\) measures how close \(G\) is to a tree. A tree decomposition of a graph \(G(V, E)\) is a pair \(\mathcal{D} = ({X_i\ |\ i \in I}, T(I, F))\) where …
Mathematics
Graph Theory
basics
treewidth
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