Alpha Epsilon Delta | |
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ΑΕΔ | |
Founded | April 28, 1926 University of Alabama |
Type | Honor |
Affiliation | ACHS |
Emphasis | Health pre-professional |
Scope | National (US) |
Motto | Truth I Pursue |
Colors | Red and Violet |
Flower | Red Rose |
Publication | The Scalpel |
Chapters | 186 |
Members | 144,000 lifetime |
Headquarters | AED National Office TCU Box 298810 Fort Worth, Texas 76129 United States |
Website | Official website |
Alpha Epsilon Delta (ΑΕΔ) is a U.S. health preprofessional honor society. The organization currently has more than 144,000 members within 186 chapters at universities throughout the United States, making it the world's largest honor society serving all students from different backgrounds in the pursuit of a healthcare career.
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Epsilon-delta definition of limits
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Epsilon-delta limit definition 1 | Limits | Differential Calculus | Khan Academy
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Lambda Theta Alpha Epsilon Delta Fall 2011 PM Salute
Transcription
In the last video, we tried to come up with a somewhat rigorous definition of what a limit is, where we say when you say that the limit of f of x as x approaches C is equal L, you're really saying-- and this is the somewhat rigorous definition-- that you can get f of x as close as you want to L by making x sufficiently close to C. So let's see if we can put a little bit of meat on it. So instead of saying as close as you want, let's call that some positive number epsilon. So I'm just going to use the Greek letter epsilon right over there. So it really turns into a game. So this is the game. You tell me how close you want f of x to be to L. And you do this by giving me a positive number that we call epsilon, which is really how close you want f of x to be to L. So you give a positive number epsilon. And epsilon is how close do you want to be? How close? So for example, if epsilon is 0.01, that says that you want f of x to be within 0.01 of epsilon. And so what I then do is I say well, OK. You've given me that epsilon. I'm going to find you another positive number which we'll call delta-- the lowercase delta, the Greek letter delta-- such that where if x is within delta of C, then f of x will be within epsilon of our limit. So let's see if these are really saying the same thing. In this yellow definition right over here, we said you can get f of x as close as you want to L by making x sufficiently close to C. This second definition, which I kind of made as a little bit more of a game, is doing the same thing. Someone is saying how close they want f of x to be to L and the burden is then to find a delta where as long as x is within delta of C, then f of x will be within epsilon of the limit. So that is doing it. It's saying look, if we are constraining x in such a way that if x is in that range to C, then f of x will be as close as you want. So let's make this a little bit clearer by diagramming right over here. You show up and you say well, I want f of x to be within epsilon of our limit. This point right over here is our limit plus epsilon. And this right over here might be our limit minus epsilon. And you say, OK, sure. I think I can get your f of x within this range of our limit. And I can do that by defining a range around C. And I could visually look at this boundary. But I could even go narrower than that boundary. I could go right over here. Says OK, I meet your challenge. I will find another number delta. So this right over here is C plus delta. This right over here is C minus-- let me write this down-- is C minus delta. So I'll find you some delta so that if you take any x in the range C minus delta to C plus delta-- and maybe the function's not even defined at C, so we think of ones that maybe aren't C, but are getting very close. If you find any x in that range, f of those x's are going to be as close as you want to your limit. They're going to be within the range L plus epsilon or L minus epsilon. So what's another way of saying this? Another way of saying this is you give me an epsilon, then I will find you a delta. So let me write this in a little bit more math notation. So I'll write the same exact statements with a little bit more math here. But it's the exact same thing. Let me write it this way. Given an epsilon greater than 0-- so that's kind of the first part of the game-- we can find a delta greater than 0, such that if x is within delta of C. So what's another way of saying that x is within delta of C? Well, one way you could say, well, what's the distance between x and C is going to be less than delta. This statement is true for any x that's within delta of C. The difference between the two is going to be less than delta. So that if you pick an x that is in this range between C minus delta and C plus delta, and these are the x's that satisfy that right over here, then-- and I'll do this in a new color-- then the distance between your f of x and your limit-- and this is just the distance between the f of x and the limit, it's going to be less than epsilon. So all this is saying is, if the limit truly does exist, it truly is L, is if you give me any positive number epsilon, it could be super, super small one, we can find a delta. So we can define a range around C so that if we take any x value that is within delta of C, that's all this statement is saying that the distance between x and C is less than delta. So it's within delta of C. So that's these points right over here. That f of those x's, the function evaluated at those x's is going to be within the range that you are specifying. It's going to be within epsilon of our limit. The f of x, the difference between f of x, and your limit will be less than epsilon. Your f of x is going to sit some place over there. So that's all the epsilon-delta definition is telling us. In the next video, we will prove that a limit exists by using this definition of limits.
History
On April 28, 1926, fifteen premedical students at the University of Alabama met with Dr. Jack Montgomery, premedical adviser and professor of organic chemistry, to formalize the organization of a new premedical honor society. Baylor University, Samford University, The University of Texas, and the University of South Carolina established chapters in 1928/29. At the first national convention at the University of Alabama on April 18, 1930, ten members representing five chapters and one petitioning group were in attendance.[1]
In February 1929 the first two women were initiated as members, making Alpha Epsilon Delta one of the earliest co-educational honor societies established.[2]
In 1949, AED was incorporated in the State of Michigan. In February 1962, the Society was reincorporated in the District of Columbia as a nonprofit, educational organization.
The business of the Society is conducted by the National Officers, Regional Directors, and active chapters, with authorization of the national convention, held biennially.
Alpha Epsilon Delta (AED) has today become the world's largest Honor Society exclusively serving premedical education, with a membership exceeding 144,000 in 186 chapters.[2]
Mission statement
"Alpha Epsilon Delta is the National Health Pre-professional Honor Society dedicated to the encouragement and recognition of excellence in preprofessional health scholarship, including medicine, dentistry, veterinary, and others. The Society welcomes ALL students engaged in the pursuit of a professional healthcare career. AED offers opportunities for intellectual and professional development, provides a forum for students with common interests, and extends a program of service to benefit the college/university community. "[2]
Symbols
The badge consists of a hexagonal key or pin on the face of which is inscribed ΑΕΔ in a longitudinal column. The key is reminiscent of the benzene ring, while the border is emblematic of the continuity of premedical science.
Baird's Manual had originally listed the society's colors as ultraviolet and infrared; the current Constitution notes them as red and violet.[2]
The official magazine, The Scalpel, is published at least two times per year, the AED Newsletter at least four times per year, as well as Notes to Alumni. [1]
Membership
Membership is open to undergraduate students with a major interest in medicine and who meet the minimum requirements. Some chapters offer an Associate membership for those who have yet to meet these requirements.
- Achievement of 3.2 or higher (on a 4.0 scale) in science and overall GPA
- Complete at least three semesters (five quarters) of college credit/preprofessional health work
- Good standing with your University's chapter
- A certain number of volunteer hours may be required as well[2]
Chapters
References
- ^ a b Anson, Jack L.; Marchenasi, Robert F., eds. (1991) [1879]. Baird's Manual of American Fraternities (20th ed.). Indianapolis, IN: Baird's Manual Foundation, Inc. p. VI-7–8. ISBN 978-0963715906.
- ^ a b c d e Current statistics per the Alpha Epsilon Delta website, accessed 4 Sept 2020.