Ringing up baby

Bringing Up a Quantum Baby

Any two infinite-dimensional (separable) Hilbert spaces are unitarily isomorphic. The sets of all their self-adjoint operators are also therefore unitarily equivalent. Thus if all self-adjoint operators can be observed, and if there is no further major axiom in quantum physics than those formulated for example in Dirac’s ‘Quantum Mechanics’, then a quantum physicist would not be able to tell a ...

Will Baby Faces Ever Grow up?

For a discussion about user interfaces for small screens, so-called baby faces, it might be interesting to start with considering another type of “baby faces” – namely, real ones. Until quite recently, human children were perceived as being basically smaller versions of adults, who were just waiting to become strong and educated enough to take their productive place in the grown-ups’ society. B...

Ringing the changes

Ringing Js refinements

Both the four-point and the uniform cubic B-spline refinement (i.e. subdivision) schemes double the number of vertices of a closed-loop polygonal curve P and respectively produce sequences of vertices fk and bk. The Js refinement proposed here produces vertices vk=(1–s)fk+sbk. Iterative applications of Js yield a family of curves parameterized by s. It includes the four-point curve (J0), the un...

Baby or bathwater?: Early follow-up after hospital discharge.

S ince 2008, the Centers for Medicare and Medicaid Services have publicly reported risk standardized 30-day readmis-sion rates for patients hospitalized with heart failure, acute myocardial infarction (AMI), and pneumonia. Over the next few years, the portfolio of readmission measures will expand to include patients with a broad range of medical and surgical conditions. 1 Furthermore, under the...