Elements Definition and 1000 Threads

Éléments is a French bi-monthly magazine launched in September 1973 and associated with the Nouvelle Droite.
With a social and European inspiration, the magazine promotes a critical vision of liberal modernity on topics such as localism, ecology, respect for cultural diversity and the defence of European identity.

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  1. J

    Properties and Elements of SO(4) Group in 4 Dimensions

    What are the properties of SO(4) group? , How this acts as a rotator in 4 dimensions?, What are the elements of Rotation matrix in a specific dimension among four dimensions?
  2. E

    Understanding Array Elements: n^2 vs. 8*n

    Homework Statement For the problem at this site http://www.kalva.demon.co.uk/putnam/psoln/psol859.html, how an array with n^2 elements contain 8*n elements (8 for each positive integer) when n is not equal to 8? Does that type of algebra not work with an infinite number of elements...
  3. G

    Group 2 Periodic Table Elements: Redox Properties & Eθ

    Nowhere in my notes does it say what Eθ is and i can't find a definition of it on the internet :confused: I'll give you the context: For group 2 of the periodic table, state and explain the trends in the following for their elements: (i) redox property, related to Eθ value
  4. R

    Why Does NH3 Form Complex Ions with Transition Elements?

    Can anybody please tell me why NH3 readily forms complex ions with transitional elements but NH4+ doesn't?
  5. P

    Exploring Mapping Conditions: Can Elements be Left Unmapped?

    Homework Statement Can there be a mapping that may not map any elements from one domain to another? The reason is that the mapping has a condition. For example, it will only map elements if the one in the domain are related in some way to the element they are mapped to (i.e congruence via a...
  6. T

    How Can I Purchase Pure Elements?

    I want to know how one purchases pure elements. Like Caesium or Neon or Chlorine. Do you need license to purchase some elements? Or do you need to be affiliated to some sort of organization? Where is a site that has prices for the elements? Just curious how one gets a hold of these...
  7. B

    Elements that cause explosion/burn

    As far a I know it's only the combination of Hydrogen, and Oxygen Atoms that cause explosion/burn, and that if there's other atoms in the mix it just causes a slower reaction. Is this true, if not then what other atoms cause explosion/burn?
  8. P

    Help Need description of formation of heavy elements

    Hi, Hope someone here can help. I'm working on explanatory graphics on how nuclear fusion works, and how the elements are formed. In particular, I need to show how elements heavier than iron are formed. The obvious process is as part of a supernova explosion, but for the life of me I can't...
  9. P

    Factorising Polynomials in Z[x]

    Homework Statement How do you factorise polynomials in Z[x]? Z is not a field so you can't use the theorem 'a is a root of f <=> (x-a) divides f' The Attempt at a Solution Would you map the polynomials from Z[x] to Q[x] by multiplying by 1, since all elements in Z[x] are in Q[x]. Then...
  10. D

    Notation for Referencing Elements in a Set

    Hi. I am just wondering, is there any notation i can use to refer to elements ONLY in a certain set. Usually, given sets A, B and C, i could refer to elements of only set A as A \cap \overline B \cap \overline C, but is there some notation that specifically refers to elements ONLY in a certains...
  11. P

    Boolean rings with identity can only take 2 elements?

    Using the theorem that in any boolean ring a+a=0 for all a in boolean ring R. Then 0 is in R. Make the multiplicative identity 1 is also in it. Therefore R can only take 0 and 1 and no more because 1+1=0. 0+0=0. 1+0=1 always. So 2 or other elements can never occur.
  12. JasonRox

    Elements of Mathematics: Algebra I Chapters 1-3 by Nicolas Bourbaki - Worth It?

    Elements of Mathematics : Algebra I Chapters 1-3 by Nicolas Bourbaki Is this a worth while book? I wouldn't mind reviewing my Linear Algebra and Abstract Algebra which to all be included in the textbook plus more in a condensed way. Sounds perfect. Reading my old textbooks just gets...
  13. N

    Why elements are sometimes called the "s" block?

    Okay guys need to know why The Group I and Group II elements of the periodic table are sometimes called the "s" block? Sorry for the vaigness of the question this is what they gave me. Cheers
  14. C

    Religous Outcry Over Synthetic Elements

    Where is the religious outcry over the manufacture of synthetic elements? To be clear, I am talking about elements which have more protons in their nuclei then are in uranium nuclei. Although it is possible that some of these elements exist naturally somewhere in the universe as a result of...
  15. Loren Booda

    Confirming stable new elements?

    Trans-uranium element production is more often confirmed from decay products. But would such a new atom be overlooked if stable? Recently, element 118 occurred in one out of 1019 collisions, and was most readily detected by its signature radiation.
  16. S

    Finding Power Dissipation in Three Series Elements

    Homework Statement Three series elements have a.c. voltages across them of 25cos(2 \pi 60t + 30') , 15cos(2 \pi 60t + 60') , 30cos(2 \pi 60t -45') Volts respectively. The current flowing is 5.2cos(2 \pi 60t + 25')A Using phasor diagram find a)total voltage b)phase angle between...
  17. B

    Sets with negative number of elements?

    Hi. :) Look what I've found here http://math.ucr.edu/home/baez/nth_quantization.html" Can anyone say is this nonsense or what, negative cardinality? I am very curious. :o
  18. S

    Explore Superheavy Elements & Their Uses

    Stable SuperHeavy Elements I'd read that a new "island of stability" of long-lived SuperHeavy elements is about to be reached. http://en.wikipedia.org/wiki/Island_of_stability The recent synthesis of Hassium-270 showed a surprisingly pleasant half-life of 30 seconds. That's pretty...
  19. S

    In each part specify the set by listing its elements

    Can anyone offer any help with these questions? Question 1: In each part specify the set by listing its elements: { x | x Є Z and (x+1)² < 10 } Answer: am i supposed to write out all the possible x's, so that my answer would be: {0,1,2,-1,-2,-3,-4} or do i write out the over...
  20. D

    Where Can I Find Tutorials on Orbital Elements Perturbations?

    Hello! First I am new at this forum and would like to say hello to everybody :) Second- I am looking for a good tutorial on artificial Earth satellites orbit perturbations. Can somebody give me an advice where I can find it? Do you know any propagation algorithms for artificial satellites that...
  21. T

    How does one acquire isotopically pure elements?

    How would one acquire an isotopically pure sample of an element? Are some available for direct purchase, or would it have to be done in-house with some sort of large centrifuge apparatus? (Im thinking about transition metals, not actinides)
  22. C

    Transforming Elements: Breaking Down Car Emissions

    Hi there, I'm trying to figure out how this works but I'm not having much luck. Doesn't help that I'm not a science person to start with, so I'm hoping somebody here can help me out. I understand the basic idea that if you have 2 Hydrogen atoms + 1 Oxygen atoms you can somehow convert the...
  23. M

    Finding Greatest, Least, Maximal & Minimal Elements for "Divides" Relation

    confused on the "divides" relation, find all greatest, least, maximal, minal elememen Hello everyone I'm not sure how I'm suppose to do this... The problem is the following: Find all greatest, least, maximal, minimal elemnts for the relations. It says to find that on exercise 16b. I...
  24. N

    Generation of gold, silver, copper elements

    "Generation" of gold, silver, copper elements Since gold, and silver, and copper are all elements, I am a little confused - are they generated, or is there already only so much of each in the Earth, period? I know I found some data on Wikipedia that indicated that the various elements can be...
  25. W

    Elements in only 1 left/right coset

    My lecture notes state that every element of a group belongs to exactly one right and one left coset of a certain subgroup, but I don't see why this should be the case, so I tries to prove it: with S and S' elements of the subgroup H of G we then have that if a certain element X of the group...
  26. M

    Confused on directions, List the elements in the subsets?

    Hello everyone. There arn't any problems like this in this section, so I'm kind of lost on what they want. It says... Let S = {a,b,c} and for each integer i = 0, 1, 2, 3 let S_i be the set of all subsets of S that have i elements. List the elemnts in S_o,S_1,S_2,S_3. Is {S_0,S_1,S_2,S_3}...
  27. M

    Emission Spectra for Elements and Compounds

    Simply put, does it ever change? That is, does the line spectrum of a particular element or compound ever change? I've been searching all over, but I'm getting different answers!
  28. R

    Need a bit of homework help about % mass of elements

    Calculate the percentage by mass of the elements shown in the following compounds A) Br in MgBr2 b) O in Ca(NO3)2 c) N in NH4NO3 any help is appreichated thanks regards
  29. V

    Find V_0 in the circuit (6 elements)

    http://img68.imageshack.us/img68/51/problem120ha2.jpg Use conservation of energy to solve for V_0. P_1\,=\,(30V)\,(-6A)\,=\,-180W P_2\,=\,(12V)\,(6A)\,=\,72W P_3\,=\,(V_0)\,(3A)\,=\,(3V_0)W P_4\,=\,(28V)\,(2A)\,=\,56W P_5\,=\,(28V)\,(1A)\,=\,28W P_6\,=\,(10V)\,(-3A)\,=\,-30W...
  30. M

    Which Elements Exist as Diatomic Molecules?

    Which elements "travel in pairs"? This isn't exactly "homework help", just something that's been on my mind for a while. I know that when writing chlorine, oxygen and hydrogen by itself, you need to add a two. Why is this so? And also, what other elements "travel in pairs"?
  31. K

    Hybridisation in d-block elements

    Hi, can someone please explain how to find the hybridisation when elements of the d-block are involved? For, example.. What is the hybridisation undergone by Fe in Fe(CN)2??
  32. L

    Elements that react with crystalline

    What element will react with crystalline causing it to lose it's organized pattern.
  33. S

    Range Of Half-lives Of Different Radioactive Elements

    The Range Of Half-lives Of Different Radioactive Elements Is From_______ A)hours To Years B)hours To Weeks C)days To Months D)seconds To Billions Of Years E)days To Weeks
  34. C

    Finite element-rod elements what is the pde

    case 1)in finite element analysis of structures using simple rod elements we do the stiffness matrix and then find the displacements from loads and constraints case 2)finite element method is a technique for solving partial differential equations. In the case1 what is the partial...
  35. L

    Final storage containing spent HTR fuel elements

    can anyone help me with the following problem: I have been asked to estimate the rise in temperature in the salt in a final storage containing spent HTR-fuel elements in a time span of 100 years. Given the following data: Average heat flux 10 W/m; Heat capacity of salt 0.9 kJ/kg.K; density of...
  36. L

    How Can the Quotient Group G/Go Act Effectively on X?

    This is question 53\gamma. Given a group G of transformations that acts on X... and a subgroup of G, Go (g * x = x for all x for each g in Go), show that the quotient group G/Go acts effectively on X. A group G "acts effectively" on X, if g * x = x for all x implies that g = e, where g is a...
  37. T

    Calculate the sum of the elements of the U4 set

    I saw this problem in a book: calculate the sum of the elements of the U4 set. The answer is 0, the elements of the sets being: 1, i, -1, -i. My questions is: what's the U set? :confused:
  38. T

    Which Groups Contain an Element, Compound, and Mixture?

    Which 2 groups of substances below contain 1 element, 1 compound and 1 mixture? pick 2 groups. A.) Gold, sodium chloride, steel B.) oxygen, iodine, air C.) methane, iron(III)chloride, sea-water D.) Helium, carbon(IV) oxide, mixed dessert E.) Bronze, stainless steel, nitrogen(IV)oxide i...
  39. T

    Group VI Elements: 3 Correct Statements

    Which of the following statements are CORRECT, concerning any elements in Group VI of the periodic table? pick out 3 CORRECT statements. A.) It has 6 valence electrons. B.) It has 6 electron shells. C.) It can form an ion of charge -2. D.) It has valency value of 2. E.) It will lose 2...
  40. C

    The Janet Periodic Table of Elements

    The Janet Periodic Table of Elements (1929) seems more "consistent" than the modern form. The location of any element (row, column) is directly related to the quantum numbers of the most significant electron of the element. Please see; http://ca.geocities.com/chemguy777/index.htm
  41. R

    A half-life question, involving 2 elements

    Element A has a half-life of T_{1} and decays into element B, which has a half-life of T_{2} , while T_{2}<T_{1} . When is the mass of element B the greatest? (i.e. after how many doublings?) I have been trying to derive a formula to calculate this, but have so far been unsuccessful.
  42. S

    Transition Elements (Naming Substances) check answers

    Name the following substances. a) [Cu(Cl4]2- - tetrachloridecopper(II) ion b) Ag(NH3)2+ - diamminesilver ion c) Cu(NH3)4SO4 - tetraamminecoppersulfate (or tetraamminecopper(II) sulfate) d) Al(H2O)6Cl3 - hexaaquoaluminum(III) trichloride...
  43. MathematicalPhysicist

    Proposition 36 of book IX in the elements

    i'm referring to this:http://aleph0.clarku.edu/~djoyce/java/elements/bookIX/propIX36.html does someone know if there's on the web another proof of this proposition, perhaps in a more readerable way. (i don't like to read also the geometrical approach and sliding through the links to the other...
  44. A

    What are the fundamental constants that govern the properties of our universe?

    Hey, I read about arbitrary elements sometime ago. Could anybody tell me what affects the values of these? And I also read that some say that the values of these are fine-tuned by the Creator. What is the general take on that?
  45. N

    Engineering Applications based on Basic circuit elements

    Newbie here! Can anybody help me about the applications based on basic circuit elements like Resistors, Inductors & Capacitors! and where can I get 2 see the pictures of these elements:frown: sorry once again ... I don't know anything .. I AM A NEWBIE Want to learn :smile:
  46. H

    What are the most abundant elements in the Biosphere?

    My list is this. 1) Oxygen with 51% 2) Silicon with 25% 3) Aluminium with 7% 4) Others I am not sure of these because I found them on the web and every site is different. I want to make sure so please anyone with Information post. Thanks :)
  47. T

    Is a 16th Century Copy of Euclid's Elements a Rare Find?

    17th Century Copy of "Elements" I found an actual 16th century (or so the seller claims, but it matches up with what I've read about, i.e., only 6 books translated, plus 11-12. etc.) copy of a translation of Euclid's "Elements". I'm very tempted to buy it, but I want to know if it's rare. This...
  48. G

    Fissionable Elements: Breeding, Unstable Isotopes, Critical Mass

    I have a few questions: can heavier elements be made from lighter ones through breeding? Do unstable isotopes of light elements (lighter than lead) give off enough enough energy , when bombarded with nuetrons, to pruduce a coniderable amount of energy? What determines an isotopes critical mass?
  49. T

    Conjugate Elements of a Symmetric Group

    Is the the following definition correct? Two elements a and b of a group G are said to be CONJUGATE if there exists g in G such that a=gbg^{-1}. For instance, show that all elements in the symmetric group S5 of order 6 conjugate.
  50. S

    Transition Elements: Octet Rule, Lewis Dot Diagrams, Stability

    I have already talked about this a little, but I have some more questions. Do transition elements obey the Octet rule? Also can you draw lious dot diagrams for them. It does not seem like you can, but I would like to know why. Also is Manganese the most stable transition element along with...
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