What is Elements: Definition and 1000 Discussions

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. R

    Global System matrix assembly with different elements.

    Hi all, I would like to know if its possible and consistent to compose the global system matrix with different FEM elements such as frame, plane, shell solid etc... Theoritically all of them will have the same DOF per node just only comprising the local matrix will differ. And as long as we...
  2. P

    Identifying parallel elements in a circuit

    In the following circuit, a) identify all combinations of 2 or more circuit elements that are connected in series and b) Identify pairs of circuit elements that are connected in parallel. http://imgur.com/keorO a) Seems easy enough, the 4 and 6 ohm resistors are in series, and so are the 5...
  3. srfriggen

    Abstract Algebra: List elements of Subgroup

    Homework Statement List the elements of the subgroups <3> and <7> in U(20). Homework Equations The Attempt at a Solution U(20)= {1, 3, 7, 9, 11, 13, 17, 19} = <3> = <7>. So basically I have that the common elements of, <3> and <7> and U(20), under + modulo 20, are all...
  4. A

    Where do the heaviest elements come from?

    Hello there! First of all, I couldn't find this topic around here but I could be blind, so if the answer is posted somewhere else, just leave me the link as a response, thank you! :blushing: I am trying to figure out few things about where the heaviest elements come from. I know that Iron...
  5. E

    Proving r is in I if rn in I | 65 Characters

    Homework Statement In the process of trying to prove something else I found it would be helpful if rn\inI, where I is an ideal, n\inN, and r\inR and R is a ring, then r is in I. Homework Equations I is an ideal if a\inI and b\inI then a+b\inI, a\inI and r\inR then ar\inI, and I is not the empty...
  6. G

    How many elements does GL(2,Z2) have?

    Homework Statement If Z2={[0],[1]} with addition and multiplication modulo 2. How many elements does GL(2,Z2)={2 by 2 matrices with determinant 1 and entries from Z2} have? The Attempt at a Solution A\inGL(2,Z2) then det(A)=[1]={...,-3,-1,1,3,5,...} Suppose A=|a b:c d| then...
  7. D

    Orbital elements - what's wrong with my calculation?

    Homework Statement Ok so this satellite is orbiting the earth. The position vector is r = -0.707i + 0.707j + 0k and velocity vector is v = 0i + 0.5j + 0k. To find Vo (the angle between vector n and e), my book said the formula to use is arccos{(e dot r)/(|e||r|)}. However, I got 98 degree by...
  8. I

    Heavy elements from red giants

    I thought all heavy elements came from supernovae, but a recent article by John Baez corrected my ignorance. There is a nice photo too at http://math.ucr.edu/home/baez/diary/index.html#now
  9. K

    Order of Group Elements: Z3 x Z3 & Z2 x Z4

    Hi i need a little help i was given group (Z3 x Z3,+) and i should find order of every elements so the elements are {(0,0),(0,1),(0,2),(1,0),(1,1),(1,2),(2,0),(2,1),( 2,2)} and the order of every element is (0,0) has order 1 (0,1)*3=(0(mod 3),3(mod 3)) = (0,0) order 3 (0,2)*3=(0(mod...
  10. O

    What is the primary source for the origin of elements?

    By choosing among the following five options, what is the main source in the universe for the origin of the elements : silicon, lithium, bismuth, nickel and uranium? Primordial nucleosynthesis – fusion in core of low-mass stars – fusion in core of high-mass stars – slow neutron capture in...
  11. O

    Exploring the Origin of Elements to Nucleosynthesis and Fusion in Stars

    By choosing among the following five options, what is the main source in the universe for the origin of the elements : silicon, lithium, bismuth, nickel and uranium? Primordial nucleosynthesis – fusion in core of low-mass stars – fusion in core of high-mass stars – slow neutron capture in...
  12. C

    Comp Sci Finding the Location of Two Elements with a Sum of 100 in an Array of 3 Elements

    I have an array of 3 known elements.I know that 2 elements of them have the sum of 100 and I need to find the location of the two elements which have this sum ex. A[3] 5 25 75 the solution for this prob. is second & third location Thanks,
  13. Z

    Kolmogorov & Fomin's Elements of Theory: Real Analysis or Lebesque?

    I'm looking for a Real Analysis book to start with, besides Spivak. On Amazon, one of the reviewers said it was good as a subsequent book for learning Functional Analysis/Lebesque Integration, while another said it was a good introduction to Real Analysis. For those of you that have read it...
  14. N

    Regarding a Group Theory Proof on the Order of Elements in a Group

    Homework Statement Prove that for a finite group A, the order of any element in A divides the order of A. Homework Equations The order of an element a of a group A is the smallest positive interger n such that an = 1. The Attempt at a Solution Well, I know that the order of a...
  15. J

    What Does a Sample Space Look Like When Rolling a Die Until a 3 Appears?

    Sample space of rolling a 6 sided die I've just had my first tutorial for an introductory probability class taught by the Econometrics department and I'm having trouble understanding why my solution is wrong. The tutor didn't write up complete solutions(just pictures to help visualise the...
  16. A

    Euclid's Elements: Proposition 7

    Alright so, I decided to read some Euclid's Elements for my own personal gain (became interested while reading Stewart's Precal, and I think it might help with Calculus) and I'm stuck on proposition 7, mainly because I really want to understand the reasoning behind it and I just can't seem to...
  17. V

    MHB If S has the same number of elements as T, then T has the same number as S....

    Hi. The proof that I'm working is in the title. The Defition of "same number as" is given as follows: (1) Two sets S and T are said to have the same nuber of elements if each element of S can be paired with precisely one element of T in such a way that every element of T is paired with precisely...
  18. V

    Fortran [Fortran] Passing elements of array to subroutine

    I have one main program where I have calculated some array, say A(i,j) If I want ot use the values in subroutine, and calculate some more values and give back the result to main program, how my syntax should be? I tried this way. Its not working. program a...
  19. S

    Repeated elements within a group - possible?

    Can there be repeated elements within a group?
  20. J

    Finite Order of Elements in Groups with Normal Subgroups

    Proposition: If every element of G/H has finite order, and every element of H has finite order, then every element of G has finite order. Proof: Let G be a group with normal subgroup H. Suppose that every element of G/H has finite order and that every element of H has finite order. We wish to...
  21. T

    Why the elements of a set have to be distinct?

    Hi, I haven't taken any set theory course during my studies and this is a query of mine, though to many of you that are familiar with this subject might seem naive. Any suggestions would be useful. Many thanks
  22. S

    Do I have to know all the euclidean elements proofs?

    Is it necessary to know the proofs of all the propositions in Euclid's elements? Or one can directly jump to euclidean and precollege geometry, of course he/she will have knowledge of propositions( just the statements and all that) but not the proofs. Reply Quickly.
  23. W

    Counting Elements in a Set: {1,2,{3},{4,5},6,{{7}8}}

    Homework Statement How many elements are in the set below? {1,2,{3},{4,5},6,{{7}8}} Homework Equations The Attempt at a Solution I heared that the best way is to take of the {} each time. But can somebody tell me the real rules for how to find solutions for this question...
  24. J

    Proof about orders of elements. Ord(a)=ord(bab^-1).

    Prove ord(a) = ord (bab-1). Attempt at the proof. Proof: Let G be a group and let a,b ε G. (=>) Suppose ord(a)=n. That is, an=e. We wish to that the ord(bab-1)=n. If we take an=e and multiply on the left by b and on the right by b-1 then, we have, (1) an=e...
  25. K

    Can't you make elements out of elements

    Can't you take a proton out of a mercury atom for example so the atomic number can change from 80 to 79 so it can become a gold atom?
  26. A

    Flexibility on spacecraft elements design

    I have no prior knowledge on engineering, but has just started my Msc dissertation about using nonlinear programming technique to model a problem that is related to spacecraft elements design. I am uncertain that whether I have fully understood the problem. The problem is to decide the...
  27. Q

    How to replace zeros in a matrix by elements of an array in Matlab?

    Homework Statement I have a matrix that contains zeros but it may contain also ones. For example: ID=[1 0 0 0; 0 0 0 0; 1 0 1 1] I'm trying to replace all the ones by zeros and all the zeros by elements of an array EA going...
  28. L

    Calculating Table Elements with Equations A & B

    Hello again! Let's say that i am calculating every element of a 100X300 table by using equation A I use two for loops (i m doing this in matlab) for i=1:100 for j=1:300 element(i,j)=... (it is the equation A) end end equation A involves the neighboring elements What...
  29. srfriggen

    Short Proof regarding elements of a vector space

    Homework Statement Let V be a vector space and v, w two elements of V. If v+w=O, show that w=-v Homework Equations The Attempt at a Solution This is my attempt: 1. v+w=O 2. v+(-v)=O 3. v+w=v+(-v). Subtracting v from both sides yields: 4. w=-v The solution...
  30. G

    The GLB & LUB of Two Elements: Non-Unique Possibilities?

    The greatest lower bound and least upper bound of two elements a, b in a lattice do not have to be unique, do they? It could be the case that two equivalent or non-comparable glb or lub exist, right?
  31. R

    MHB Infinite elements in the universal sets

    is it possible to make a venn diagram wherein the elements are infinite elements? ex. V = { is the set of all odd numbers) W = { 5, 15, 25, 45, 55,...} thanks a lot
  32. P

    Why aren't mixed ratios allowed in Euclid's Elements ?

    Why aren't mixed ratios allowed in Euclid's "Elements"? Why did Euclid forbid the comparing of different kinds of magnitudes? And was it the same for numbers? Or were ratios specifically meant for magnitudes (lines, planes, solids) What are the consequences of comparing 2 different kinds of...
  33. J

    Did the heaviest elements come from other galaxys

    did the heavier elements come from different galaxys? I am a gcse student who is in a bit of a debate with my teacher :)
  34. A

    Periodic Table/ Elements toxic to one another?

    So Arsenic is poisonous to Oxygen based life forms (Humans). What would be poisonous to a Sulfur based life form (if they exsisted)?
  35. H

    MHB Finding elements in a quotient ring

    I have to describle the elements of the quotient ring $$\frac{\mathbb{Z}[x]}{2\mathbb{Z}[x]+x^2\mathbb{Z}[x]}$$ do I use the division algorithm to write any element as $$f(x)=(x^2+2)q(x)+r(x)$$ where $\operatorname{deg}(r(x))<2$ so the elements of the ring are the linear polynomials over...
  36. Q

    Calculate the stress in 2 elements

    Homework Statement Let assume that we have two rectangular prism elements of similar dimensions: e.g. 1.) x0=100.1, y0=100.2, z0=90.4 2.) x0=100.2, y0=100.4, z0=90.0 How can I calculate the stress tensor of each of the two elements if I assembly them by merging their z-y faces...
  37. J

    About the number of irreducible elements in UFD ring

    When chracterizing the definition of unique factorization domain ring, the Hungerford's text, for example, states that UFD1 any nonzero nonunit element x is written as x=c_1. . .c_n. Does this mean any nonzero nonunit element is always written as a product of finitely many irreducible...
  38. J

    Find Best Combinations of Non-Overlapping Matrix Elements

    Algorithm for finding best (or combinations of) "non-overlapping" matrix elements. I'm looking for the best general way to find the "best" combination for a list of non-overlapping matrix elements. For example, given the matrix AE BE CE DE AF BF CF DF AG BG CG DG AH BH CH DH...
  39. N

    Stern-Gerlach Predictions of Elements

    I am baffled at the answers to the following HW quesitons compared with what I thought I knew about the topic. Hoping I can get my misunderstandings cleared up. Question 1 How many lines are expected on a detector plate of a Stern-Gerlach experiment if a beam of a) potassium atoms b)...
  40. R

    Solar elements and their placement

    Hello again everyone, Physics Noob is back again. I had a question about solar formation that has me stumped. If you hadn't read my previous post, I am a newcomer and hobbist of physics so don't expect me to know everything or equations on physics. Again, I may come off sounding like an...
  41. A

    The order of all elements of (Z/ 7161 Z)* divide 30

    Hi, Homework Statement Show that for every x in (Z/ 7161 Z)*, the order of x divides 30. Homework Equations (Z/ 7161 Z)* is the group of units of Z/ 7161 Z. The Attempt at a Solution I factorised 7161: 7161 = 3 * 7 * 11 * 31 I used the Chinese remainder theorem to show that (Z/...
  42. A

    What is the photon sphere and where is the singularity in a black hole?

    Hi, I somewhat know the basics about black holes. Tell me if I'm wrong. --A black hole is formed when a supermassive star (one of many theories of the formation of black holes) burns out due to exhausted fusion reactions. It can no longer support its own mass and the core collapses in on...
  43. L

    The Set of all elements X ? What does this mean?

    "The Set of all elements X" ? What does this mean? I know it's really simple but I don't understand what it means. In set builder notation when I'm describing a particular set I know for example: {10,11,12,13,14,15} is {x |x is a whole number greater than 9 less than 16} and is read "the set...
  44. R

    Elements in sets that are common

    let A={z|z^6=√3 + i} B=(z|Im(z)>0} and C={z|Re(z)>0} find A∩B∩C the part previous to this qn asks me to find the roots of z^6 and I've already down that. but i have no idea how to proceed with this, so do i draw my unit ciorcle with the hexagon and then follow to see what regions satisfies with...
  45. A

    How did elements and building blocks of life arrive on Earth?

    we are currently learning about radioactivity and i have become curious of how these heavier elements came to Earth in the first place? From what i understand, the lighter elements are formed by fusion in stars, but even so, how could these lighter elements reach us when the stars are so far...
  46. C

    Ionization energy - compare 2 unknown elements and decide their group

    Hello. I have a question about ionization energy: Two hypothetical elements in the 2nd or 3rd period have the following ionization energies: Element X First: 800 kJ/mol Second: 2500 kJ/mol Third: 3900 kJ/mol Fourth: 23000 kJ/mol Element Y First: 700 kJ/mol Second: 2200 kJ/mol...
  47. M

    Determining the number of elements in the relative complement of a set

    Hello, I have been very obsessed with a board game called Hex lately. I am trying to calculate the number of completed states (all positions filled in) on a 3x3 board where a certain player wins, given that some positions are already filled. I have attached a diagram illustrating what I am...
  48. Y

    Elements on Earth: Supernova & Planets

    If super nova is responsible for all elements on earth, including the ones that humans were made from, why aren't all elements found on every planet?
  49. B

    Elements with exceptional electronic configuration

    [b]1. Homework Statement [/b Some elements having exceptional electronic configuration have 2 shells having e not completely filled. Like Rh has configuration 4s2 4p6 4d8 5s2 now when we study how atoms combine we consider only the outermost shell because it is the only one not filled...
  50. J

    Man-Made Elements: What Are They?

    Anyone have a list of man made (replicated) elements?
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