1. (a) Determine the smallest subring S (with identity) of the real numbers R that contains 3/5 (give a simple description of the elements of S and prove that S is a subring) (b) Is S an integral domain? (c) Find all units of S. (d) What is the characteristic of S? (e) Find the field of fractions of S (f) Find the smallest ideal I of R that contains 3/5 (of corse, justify all your answers).
Let R be a ring, let S be a subring of R and let' be an ideal of R. Note that I have proved that (5+1)/1 = {5 +1 | 5 € S) and I defined $:(5+1) ► S(SO ) by the formula: 0/5 + 1)=5+(SNI). In the previous video I showed that was well-defined. Now show that is a ring homomorphism. In other words, show that preserves both ring addition and ring multiplication. Then turn your work into this...
INSTRUCTIONS Let S and T be two subrings of ring R. Use the subring criteria to show their intersection is also a subring of R BMISSION Let R be a ring, let S be a subring of R, and let I be an ideal of R. In the video I showed Aa that if s € S and a € SnI then as € SAI. Complete the proof that snl is an ideal of S * by showing that if...
In the previous video, I made the assumptions that Ris a ring, S is a subring of R and I is an ideal of R. It turns out that the hypothesis that I is an ideal is critical. Show that this hypothesis is critical by proving the following statement: Let R be a ring, and let S and I be subrings of R. Show that S + I is NOT necessarily subring of R by showing that multiplication is not...
(i) Show that R is a subring of the polynomial ring Rx. | R{]4 (ii) Let k be a fixed positive integer and be the set of all polynomials of degree less than or equal to k. Is R[xk a subring of R[a]? 2r4+3x - 5 when it is (iii) Find the quotient q(x divided by P2(x) of the polynomial P1( and remainder r(x) - 2c + 1 in - (iv) List all the polynomials of degree 3 in Z...
(i) Show that R is a subring of the polynomial ring Rx. | R{]4 (ii) Let k be a fixed positive integer and be the set of all polynomials of degree less than or equal to k. Is R[xk a subring of R[a]? 2r4+3x - 5 when it is (iii) Find the quotient q(x divided by P2(x) of the polynomial P1( and remainder r(x) - 2c + 1 in - (iv) List all the polynomials of degree 3 in Z...
Let R and S be PIDs, and assume that R is a subring of S. Assume the following about R and S: If, for an element , there exists a non-zero with , then . Show: If is a greatest common divisor in S for two elements a and b in R (not both 0), then d is a greatest common divisor for a and b in R. sES TER We were unable to transcribe this imageWe were unable to...
subring of the polynomial ring R{z] (i Show that R is a (ii) Let k be a fixed positive integer and Rrk be the set of all polynomials of degree less than or subring of Ra (iii) Find the quotient q(x) and remainder r(x) of the polynomial P\(x) 2x in Z11] equal to k. Is Rr]k a T52r43 -5 when divided by P2(x) = iv) List all the polynomials of degree 3 in Z2[r]. subring of the polynomial ring R{z]...
Prove the following: (a) Let V be a vector space of dimension 3 and let {v,U2,U3} be a basis for V. Show that u2, u2 -2+s and uvi also form a basis for V (b) Show that1-,1-2,1-- 2 is a basis for P2[r], the set of all degree 2 or less polynomial functions. (c) Show that if A is invertible, then det A (Note: Show it for any det A-1 square matrix, showing it for a 2 x 2 matrix...
A1. Let (A, B, C, D) be a SISO system in which A is a (n x n) complex matrix and B a (n x 1) column vector, let -1 V = {£ajA*B: aj e C; j= 0, ...,n- (i) Show that V is a complex vector space. (ii) Show that V has dimension one, if and only if B is an eigenvector of A AX for X E V. Show that S defines a linear map from S: V...