Mr MacPherson, a mathematician
Was married to Sally, a keen statistician.
With little division to trigger vexation
Their conjugal lives led to multiplication.
First Roland, then Harry and then the addition
Of first daughter Jenny, a gifted logician.
The one common factor of great satisfaction
Engendering fervour and strong interaction
Was love of arithmetic, logic and theories
Together with quantum and harmonic series.
In sum, they endeavoured on every occasion
To bring mathematics inside the equation!