The dihedral group D4, for example, can be generated by two elements r and f (for example, r = r1, the right rotation and f = fv the vertical (or any other) reflection), which means that every symmetry of the square is a finite composition of these two symmetries or their inverses.
Use side- mirrors of cars, windows, or any other reflection to check.
We reject any reflections with fewer than four observations; for all other reflections, we merge the observations in each group using Equation 20.
Here, the lattice is rotating; the (104) reflection and, thus, the orientation of the {104} planes remain unchanged while all other reflections change.
Whether through books and papers, Radio Berkman and archived talk videos, the weekly Buzz, the many individual or project blogs, our twitter list, the Tuesday luncheon series, or any of the other reflections of work and focus, we hope you are able to get a sense of our interests, approach, and aims.
I REMEMBER NOTHING: And Other Reflections, by Nora Ephron (Vintage, $14).
In contrast, other reflections are blurred and vague.
The third is her final essay collection, I Remember Nothing: And Other Reflections, from 2010.
Nora Ephron on writing, sexism, and her new book, "I Remember Nothing: and Other Reflections".
I REMEMBER NOTHING: And Other Reflections, by Nora Ephron (Knopf, $22.95).
