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College Mathematics Corner

Inequality in intergation (TIFR 2014 problem 6)

Question: Let \(f:0,1 \to \mathbb{R} \) be a continuous function. Which of the following statement is always true? A. \( …

Convergence of sequence (TIFR 2014 problem 5)

Question: Let \(a_n= (n+1)^{100}e^{-\sqrt{n}}\) for \(n \ge 1\). Then the sequence \(a_n\) is A. unbounded B. bounded but not convergent …

Checking for Uniform continuity(TIFR 2014 problem 4)

Question: Let \(f:0,\infty)\to \mathbb{R}\) be defined by \( f(x)=x^{2/3}logx\)  for \(x>0 \) \(f(x)=0\) if \(x=0\) Then A. f is discontinuous …

Function bounds from derivative limits (TIFR 2014 problem 3)

Question: Let \(f:\mathbb{R}\to \mathbb{R}\) be a differentiable function such that \(\lim_{x\to \infty} f'(x)=1\) then A. f is bounded B. f …

Continuous Bounded Function (TIFR 2014 problem 2)

Question: (MCQ) Let \(f:\mathbb{R}\to \mathbb{R}\) be a continuous bounded function. Then A. f has to be uniformly continuous B. there …

Negation (TIFR 2014 problem 1)

Question: (MCQ) Let A,B,C be three subsets of \(\mathbb{R}\) The negation of the following statement: For every \(\epsilon >1\), there …

Convergence of alternating series (TIFR 2013 problem 40)

Question: True/False? The series \(1-\frac{1}{\sqrt2}+\frac{1}{\sqrt3}-\frac{1}{\sqrt4}+…\) is divergent. Hint: Recall the alternating series test (or the Leibniz test) Discussion: Let \(a_n=\frac{1}{\sqrt{n}}\). …

Rank and Trace of Idempotent matrix (TIFR 2013 problem 39)

Question: True/False? If \(A\) is a complex nxn matrix with \(A^2=A\), then rank\(A\)=trace\(A\). Hint: What are the eigenvalues of \(A\)? …

Eigenvalue of differentiation (TIFR 2013 problem 38)

Question: True/False? Let \(V\) be the vector space of polynomials with real coefficients in variable \(t\) of degree \( \le …

Checking irreducibility over \(\mathbb{R}\) (TIFR 2013 problem 37)

Question: True/False? The polynomial \(x^3+3x-2\pi \) is irreducible over \(\mathbb{R}\) Hint: When is a odd degree polynomial irreducible over \(\mathbb{R}\)? …

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