Tuesday, February 16th, 2010
I actually have a few questions about recommendation letters.
1. How should I go about asking teachers for them?
2. Is there anything I should give my teachers if they say yes?
3. Is there anything else I should know about recommendation letters?
1. I would choose teachers with whom you have a strong, personal relationship. You certainly want to select teachers whose classes you have done well in. I would simply approach them before/after class and ask "Would you be comfortable writing a letter of recommendation for me? I am applying for …." If this is not feasible, send them an e-mail asking if they would be comfortable writing a letter of recommendation and explaining why you would like a letter from them.
2. It is customary to give the teacher an envelope in which to place their recommendation. Depending on the program you are applying for, you may need to address and stamp it separately and have the teacher sign the seal (therefore preventing any tampering with the envelopes contents). Some programs will ask that you have the professor mail the envelope separately, while some request that you include it in your general mailing.
3. Remember that the teacher is doing you a favor by writing a letter of recommendation. Try to make it as easy for them as possible, including explaining what the program is you are applying for. Do not try to dictate what the teacher says. If they ask you, be prepared to talk up a few competencies you have demonstrated in their class or activities that you feel are relevant.
Good Luck!
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Saturday, February 13th, 2010
There are n letters for n people.
But the envelopes are blank.
The postman deliver the letters randomly to all the receivers.
What is the probability that NO receiver get his right letter?
Please explain in details, and in the general case and give the general fomular (the case of n people).
Thank you very much.
A "derangment" is a permutation of elements such that each element is placed in a spot different from it’s original position.
Derangement numbers grow very quickly according to a recursive relationship. Like many problems in combinations and permutations, it must be pre-defined what the number of derangements is when n = 0. As such, mathematics defines the number to be 1.
So, If n = 0, it is defined that there is one way to "derange" the available elements (since there are none, it must just be defined, like 0!). If n = 1, it is impossible to derange the 1 item. From there, the formula for calculating the number for derangements goes as follows:
Let X(n) be the number of ways to derange n elements. X(0) = 1, X(1) = 0, and:
X(n) = (n-1) * (X(n-1) + X(n-2))
X(2) = (1) * (X(1) + (X(0)) = 1 * (0 + 1) = 1. If there are two items, there is only one way to derange them. BA.
X(3) = (2) * (1 + 0) = 2. If there are three items, there are two ways to derange them: BCA, CAB.
X(4) = (3) * (2 + 1) = 9. If there are four items, there are nine ways to derange them. BADC, BCDA, BDAC, CADB, CDAB, CDBA, DABC, DCAB, DCBA.
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Monday, February 8th, 2010
Martin Yale 62001 High Speed Letter Opener with Tray The Martin Yale 62001 automatic high speed letter opener is designed to open up to 17,500 envelopes per hour. This makes the Martin Yale 62001 automatic letter opener one of the highest speed high speed letter openers available on the market. Built for large mailrooms and organizations that deal with huge volumes of mail the Martin Yale 62001 is adjustable to accommodate different envelope sizes and types. All you need to do is place a stack of envelopes up to 6″ high in the feed tray and let the machine do the work. The 62001 automatic letter opener opens stacks of letters in a few minutes rather than hours. This allows you to use your time doing other tasks while your letter opener does the job. Try the Martin Yale 62001 automatic letter opener today and allow it to pay for itself in no time at all. Product Details:
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Thursday, February 4th, 2010
Martin Yale 62001 ( PRE62001 ): Automatic High-Speed Electric letter Opener, Concealed Blade, 10-5/8″, Gray; For large volume, high-speed processing. Automatically feeds & opens envelopes up to 1/4″ thick. Opener accepts up to a 6″ high stack of envelopes. Feeds, opens & stacks up to 17,500 envelopes per hour. Fully enclosed, self-sharpening blade adjusts for narrow or wide cut. Removable receiving tray. AC Operation. Blade Type: Concealed; Blade Material: Steel; Handle Type: n/a. .. PRE62001 or PRE-62001
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Monday, January 18th, 2010
The Desk Saver™ Envelope/Letter Sorter has six slots, 1″ wide and will accommodate a variety of envelopes, letters, and other items. This is a great accessory to sort and hold items but out of the way and readily accessible. 10126 Features: Six wide slots hold all kinds of envelopes, letters, bills, notes, etc. Easy to sort and slot in compartments for priority handling Never waste time looking for an envelope or letter again Strong heavy formed wire rods provide stable slot separations Heavy gauge metal makes this very Stable, Strong, and Durable Black – baked powder coating Finish: Black Dimensions: 7″(W) x 8″(D) x 3 3/8″(H)
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