I need some help proving the Matrix Addition in general is associative. Any help is apriciated. Thank you
Let A B and C be NxM matrices and X_{i,j} denote the i,j th elements of a matrix C. As the i j th component of the sum of two matrices is the sum
of their individual i j th components and ordinary addition is associative:
Then [(A+B)+C]_{i,j} = (A+B)_{i,j} + C_{i,j} = A_{i,j} + B_{i,j} + C_{i,j}
.............................= A_{i,j} + (B+C)_{i,j} = [A+(B+C)]_{i,j}
RonL
Hello, holmesb!
Prove that Matrix Addition is associative.
To add two similar matrices, we add the corresponding elements and create a third matrix.
. . Symbolically, this can be wirrten: .P + Q .= .(pij) + (qij) .= .(pij + qij)
Given three similar matrices: .A, B, C
. . we want to show that: .A + (B + C) .= .(A + B) + C
Then: .A + (B + C) .= .(aij + [bij + cij]) .[1]
.and: .(A + B) + C .= .([aij + bij] + cij) .[2]
Since addition is associative, [1] = [2].
. . Therefore: .A + (B + C) .= .(A + B) + C