construct a `2xx3 "matrix" A=[a_(ij)]`, whose elements are give by `a_(ij)= {{:(i-j"," gej),(i+j"," lt j):}`

Explanation

To construct the \(2 \times 3\) matrix \(A = [a_{ij}]\) with the given conditions \(a_{ij} = \begin{cases} i - j & \text{if } i - j \geq j \\ i + j & \text{if } i + j < j \end{cases}\), we will evaluate each element of the matrix step by step.

### Step 1: Define the dimensions of the matrix
We know that matrix \(A\) is \(2 \times 3\), which means it has 2 rows and 3 columns. Thus, we will evaluate \(a_{ij}\) for \(i = 1, 2\) and \(j = 1, 2, 3\).

### Step 2: Calculate \(a_{11}\)
For \(i = 1\) and \(j = 1\):
- Calculate \(i - j = 1 - 1 = 0\)
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