matrix elements and loading the pushdown stack

Referring to Equation 1 to identify the matrix elements,

i, j, k, l - push elements z₁₁, z₁₂, z₂₁, z₂₂

I, J, K, L - push elements m₁₁, m₁₂, m₂₁, m₂₂

B, b - check sign, confinement of Trace(Z)

T, t - push half the trace of period matrix; of instantaneous Z

P, p - pop stack, repeat top element

c - clip the number atop the stack

F - detect the classically forbidden region

Q - quit for large coordinates

v - push the independent variable

n - push the numerical datum