IsSkewSymmetric
Tests if a matrix is skewsymmetric.
Syntax

IsSkewSymmetric(A[, ε])

A
is a matrix 
ε
is a positive number

Description
If A
is a matrix, then IsSkewSymmetric(A)
returns true
iff A
is skewsymmetric, that is, iff A
is square and A[i, j] = −A[j, i]
for all valid indices i
and j
. Floatingpoint comparisons are made with epsilon ε
.
Examples
A ≔ ❨❨0, 2, 1, 1❩, ❨−2, 0, −1, 2❩, ❨−1, 1, 0, −2❩, ❨−1, −2, 2, 0❩❩
⎛ 0 2 1 1⎞ ⎜−2 0 −1 2⎟ ⎜−1 1 0 −2⎟ ⎝−1 −2 2 0⎠
IsSkewSymmetric(A)
true