Question

Range of values for $\frac{\langle f | \mathbf n \cdot \boldsymbol \sigma |f \rangle}{\langle f | f \rangle}$, with $|\mathbf n| = 1$?

score 43 · Answer 1 · 2026-03-27 06:12:34

43

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Range of values for $\frac{\langle f | \mathbf n \cdot \boldsymbol \sigma |f \rangle}{\langle f | f \rangle}$, with $|\mathbf n| = 1$?

Published on 27 Mar 2026 - 6:12

score 58 · Answer 2 · 2026-04-01 03:45:40

58

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How do I define the proper subset $\bigcup\limits_{i=1}^\infty[n^2,n^2+1]$ of a set $\bigcup\limits_{i=1}^\infty[n,n+1]$

Published on 01 Apr 2026 - 3:45

score 141 · Answer 3 · 2026-03-25 20:12:01

141

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Why is this alternating summation involving reciprocals of divisors always positive? A conjecture.

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score 84 · Answer 4 · 2026-03-25 23:10:37

84

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score 301 · Answer 5 · 2026-04-07 04:23:38

301

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score 27 · Answer 6 · 2022-03-06 03:37:05

27

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Proof explanation: Bounding of $\mathcal{C}^1[a,b]$ functions which vanish at $a,b$ (among other conditions)

Published on 06 Mar 2022 - 3:37

score 80 · Answer 7 · 2026-04-02 18:42:43

80

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score 54 · Answer 8 · 2022-03-07 05:16:02

54

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score 184 · Answer 9 · 2022-03-08 00:37:13

184

Views

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score 166 · Answer 10 · 2022-03-08 04:34:26

166

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score 464 · Answer 11 · 2026-03-27 06:08:20

464

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Bounding spectral radius of special matrix

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score 162 · Answer 12 · 2026-03-31 14:28:21

162

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Published on 31 Mar 2026 - 14:28

score 103 · Answer 13 · 2026-03-30 16:48:49

103

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Lower bound for $\| (I+A)^{-1} - (I+B)^{-1}\|$ where $A, B \ge 0$

Published on 30 Mar 2026 - 16:48

score 41 · Answer 14 · 2026-03-31 12:11:06

41

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score 68 · Answer 15 · 2022-03-10 11:08:33

68

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Tight upper bound for $\sum_{m=2}^n \frac{ \log m}{m^2}$.

Published on 10 Mar 2022 - 11:08

List Question

Range of values for $\frac{\langle f | \mathbf n \cdot \boldsymbol \sigma |f \rangle}{\langle f | f \rangle}$, with $|\mathbf n| = 1$?

How do I define the proper subset $\bigcup\limits_{i=1}^\infty[n^2,n^2+1]$ of a set $\bigcup\limits_{i=1}^\infty[n,n+1]$

Why is this alternating summation involving reciprocals of divisors always positive? A conjecture.

Tridiagonal matrix with main diagonal equal to 1, inverse 1-norm upper bound

Error Bound in Binomial Approximation to Poisson

Proof explanation: Bounding of $\mathcal{C}^1[a,b]$ functions which vanish at $a,b$ (among other conditions)

Uniform lower bound of the inner product of two positively correlated random variables

Least & Greast Upper/Lower bounds

Behavior of self convolution of 1/n

Upper and lower bounds for $\int_0^\infty e^{-u(u^\epsilon -1)}\,du$

Bounding spectral radius of special matrix

Number of Subsets of Cardinality at most $k$ of a Finite Set

Lower bound for $\| (I+A)^{-1} - (I+B)^{-1}\|$ where $A, B \ge 0$

How to evaluate the upper-bound for a multiobjective optimization problem?

Tight upper bound for $\sum_{m=2}^n \frac{ \log m}{m^2}$.

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