  The relationships between five classes of monotonicity, namely 3^*-,
3-cyclic, strictly, para-, and maximal monotonicity, are explored for linear
operators and linear relations in Hilbert space. Where classes overlap,
examples are given; otherwise their relationships are noted for linear
operators in $\mathcal{R}^2$, $\mathcal{R}^n$, and general Hilbert spaces.
Along the way, some results for linear relations are obtained.
