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|Christian Wenz||O'Reilly Media||ePub|
By including the ASP.NET AJAX
|Satinder Bal Gupta and C.P. Gandhi||Laxmi Publications|
MONOIDS AND GROUPS
In the present chapter, we introduce the concept of algebraic system, binary operations and groups. The study of cyclic groups, normal groups, group homomorphism etc. help us in understanding various applications of computer science. Groups play an important role in coding theory.
8.2. ALGEBRAIC STRUCTURE
If there exists a system such that it consists of a non-empty set and one or more operations on that set, then that system is called an algebraic system. It is generally denoted by
(A, op1, op2, ..., opn), where A is a non-empty set and op1, op2, ..., opn are operations on A.
An algebraic system is also called an algebraic structure because the operations on the set A define a structure on the elements of A.
8.3. BINARY OPERATION
Consider a non-empty set A and a function f such that f : A × A → A, then f is called a binary operation on A whose domain is the set of ordered pairs of elements of A. If ∗ is a binary operation on A, then it may be written as a ∗ b.See All Chapters
|Hillel Bardin||Indiana University Press||ePub|
After prison it was good to get back to the dialogues with our group from Beit Sahour. The first few discussions were at Ghassan’s house in the evening. Across from his house was a driveway that led into an inner court, hidden from the street. There, we would park our cars so that soldiers would not see them. After several dialogues, the Palestinians decided to have each meeting at a different home, so as not to attract too much attention to any one house. For me it was interesting to be in different homes, so that I could see how people lived and meet each host’s family.
One evening, toward the end of the session, Ghassan asked whether we would like to meet a man who had just been released from five months in the Ketziot prison camp in the Negev desert. We all agreed, and walked a couple of blocks to the home of Dr. Jad Isaac, an agronomist who taught at Bethlehem University. I had read about Dr. Jad in the papers. One tactic of the intifada was to make the Palestinians more self-sufficient and less dependent on the Israeli economy. This could help economically and would make it easier for people to survive the frequent curfews. Many Palestinians began growing pigeons and chickens as a local supply of protein. Jad opened a plant store and gave the urbanized population instructions about growing vegetable gardens in their backyards, similar to the “victory gardens” of World War II. The authorities saw this as weakening their control, and ordered him to close his store, which he did. Nonetheless, he was arrested and given six months’ administrative detention. “Detention” may sound like house arrest, but it is in fact imprisonment in a prison, with the only difference being that the detainee does not know what he is charged with and gets no trial.See All Chapters
|Alex Martelli||O'Reilly Media||ePub|
The Python interpreter program is run as python (its named python.exe on Windows). python includes both the interpreter itself and the Python compiler, which is implicitly invoked, as needed, on imported modules. Depending on your system, the program may have to be in a directory listed in your
The Python installation directory. A lib subdirectory, containing the standard Python library modules, should exist under this directory. On Unix-like systems, the standard library modules should be in subdirectory lib/python-2.3 for Python 2.3, lib/python-2.4 for Python 2.4, and so on.See All Chapters
|Jack Dykinga||Rocky Nook-IPS||ePub|
Occasionally, strong images appear to suddenly jump into my camera, but that’s not the norm. I usually spend a lot of time fussing about compositions. I circle the principal elements to imagine compositions, I change the camera angle, I shoot into the light or with the light, and I change lens focal lengths. I call this working the situation.
Of course, there’s always something about a subject or scene that draws my initial attention. The challenge is to create an image that shows the viewer the aspect I found so interesting. After hiking all over the White Sands National Monument in New Mexico, I found a curved yucca emerging from a partially buried base in a pristine section of dunes. I loved the simplicity of the scene. The series of six images shown here demonstrates how I worked the situation.
My first image  was made as the pre-dawn Earth-shadow light began to illuminate the sky. I wanted to show the transition of color in the sky and composed accordingly. I left plenty of room at the top of the frame to illustrate the light known as the Belt of Venus and photographed the progression of the light’s intensity and color until I felt I had what I was after. Ultimately, this occurred when the first light of dawn kissed the mountainous background.See All Chapters
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