Prove or disprove: there is a one-to-one map from A to B if and only if there is a onto map from B to A.
Prove or disprove: there is a one-to-one map from A to B if and only if...
Consider the function ?:ℤ×ℤ×ℤ→ℤ, defined by ?(?,?,?)=?2?−?3. a) Is ?f a one-to-one function? Prove or disprove. b) Is ?f an onto function? Prove or disprove.
Prove or disprove: Two events A and B are independent if and only if they are disjoint.
Let
be a map
Define the map
prove or disprove
2)
for all
3)
for all
A B We were unable to transcribe this imagef(and) = f(c) n (D) CD CA f-1( EF) = f-1(E)f-1(F) We were unable to transcribe this image
Prove/disprove that for any linear function f there is only one matrix [A] for which f(x) = [A]x for all x.
10. Let A, B, and C be sets. (a) Prove or disprove: if A - C CB-C, then ACB. (b) State the converse of part (a) and prove or disprove.
a) Prove or disprove: if S,TELluv) then trace ('st) = trove's) tracel T) b) Prove or disprove, if S.TELIVE) then det (5+ 7) = det (5) + det (7)
Prove or disprove the following. (a) R is a field. (b) There is
an additive identity for vectors in R^n. (If true, what is
it?)........
1. Prove or disprove the following. (a) R is a field (b) There is an it?) additive identity for vectors in R". (If true, what is (c) There is a is it? multiplicative identity for vectors in R". (If true, what (d) For , , (e) For a, bE R and E R", a(b) =...
Prove or Disprove #3
(d) For each of the following, prove or disprove: iii) There is an element of X × Y with the form (a, 3a)
(d) For each of the following, prove or disprove: iii) There is an element of X × Y with the form (a, 3a)
Prove or disprove the following expression. (Prove: using Boolean algebra. Disprove: using truth table.) (NOT is presented by -.) 1. a + b (c^- + d)^- = a^-b^- + a^-cd^- 2. ab^- + bc^- + ac^- = (a + b + c) (a^- + b^-+ c^-) 3. a^- + bd^-^- (c + d) + ab^-d = ac^-d + ab^-cd + abd
61. Prove or sets A, B, and C disprove: A A (BnC) (A A B) n (A A C) for all