### Real *-Subalgebras of the Real Analog of $B(H)$ and their Strong Closure

1+ hour, 22+ min ago —
...$ It seems to me nothing changes in the proof given in **Murphy**, but...

### Domain of $f(x)$ is $mathbb{R},f(x+y)+f(x)f(y)=4xy,f(frac{1}{2}) ne 0$.What is the parity of $f(x-frac{1}{2})$?...

1+ hour, 29+ min ago —
...$endgroup$ â **Brian** **Moehring** Commented 25 mins ago - $begingroup... ...$endgroup$ â **Jack** Commented 15 mins ago...

### Can there exist a definable "ultrafilter" on the ordinals?

2+ hour, 35+ min ago —
...Can there exist a **model** $M$ of $ZF$ (or $ZFC$) that contains a definable...

### Optimization with equality constraints of the form : $x_2=x_3*x_1$?

1+ hour, 59+ min ago —### Unitary equivalence of two positive operators

3+ hour, 14+ min ago —### Universal properties in ring theory

2+ hour, 26+ min ago —
...You can check out the **Wikipedia** page on Universal property, but there...

### pi for a specific definition of Dedekind cut

1+ hour, 29+ min ago —
...Considering $alpha$, with $varnothing neq alphaneq mathbb{Q}$, a **Dedekind**... ...pi for a specific definition of **Dedekind** cut (ii) given $sin alpha...

### $p:Gtimes Kto G,;(g,k)mapsto g$. Proof that the groups $(Gtimes K)/ker p$ and $G$ are isomorphic...

2+ hour, 53+ min ago —
...Let $G$ and $K$ be groups, and define $p:G**times** Kto G,(g,k)mapsto... ...Then $p$ is a surjective homomorphism and $(G **times** K)/Hcong G$...

### Are the problems in Analysis by Amann and Escher good? Which book has the best problems?

2+ hour, 53+ min ago —
...Are the problems in Analysis by **Amann and Escher** good?...

### Upper Bound on the Magnitude of the Action of the Chebyshev Derivative Matrix

3+ hour, 3+ min ago —
...**Society** for **Industrial** and **Applied** **Mathematics** in 2000.... ...be found in the publication by **Lloyd** N.... ...**Trefethen**, titled "Spectral Methods in MATLAB," published by the...