What is the approximate identity? - Mathematics Stack Exchange An approximate identity (in the sense that you've described) is a sequence of operators, usually derived from some "nice" class, that converge to the identity operator in the sense that you described
When do spectrum and approximate point spectrum differ? But the way these things are discussed makes me doubt my conclusion For example the Wiki page says at some point that " It can be shown that the approximate point spectrum of a bounded multiplication operator equals its spectrum ", and the qualifier "multiplication" here would imply my conclusion is wrong
Difference between ≈, ≃, and ≅ - Mathematics Stack Exchange In mathematical notation, what are the usage differences between the various approximately-equal signs "≈", "≃", and "≅"? The Unicode standard lists all of them inside the Mathematical Operators B
An approximate eigenvalue for - Mathematics Stack Exchange Show that any eigenvalue for $ T $ is an approximate eigenvalue for $ T $, and that any approximate eigenvalue for $ T $ lies in the spectrum of $ T $, which we denote by $ \sigma (T) $
Approximate a function from points - Mathematics Stack Exchange I would like to approximate a polynomial equation from a series of points Searching around this site I found this post which pointed to the Lagrange Interpolating Polynomial The challenge howeve
How to approximate $\sin x$ without using trigonometry tables? An Opening Note : First of all, I want to make this very clear that by the phrase "without using trigonometry tables", I mean without using them to find $\\sin$ values of the "non-standard angles" (