[□] □
[□=□] □
[□ | □] □
However , I would also recommend that the book be used as a textbook for a " Chemistry in Society " course , because it includes ample chemical structures , equations , definitions , and concepts in a fashion that introduces chemistry sufficiently to a nonscience major . One way of reducing estimation error is to impose some form of structural assumptions , but since little is known about the actual mechanisms of financial markets , such assumptions will instead introduce specification error . One of Dr. Allis 's most important discoveries may be the role of histone modifications on gene expression and DNA , introducing research into the idea that genes consist of more than just DNA , but DNA plus the associated histones and other factors . In the second part , geometry is used to introduce lattice theory , and the book culminates with the fundamental theorem of projective geometry . Description : Emulex introduces 4Gb / s PCI express connectivity " Zephyr " controller .