User:CrZTgR/T.Fund

$d_{t_n} \$ [or $d_{u_m} \$ ]	the shortest or most efficient distance from S to T_n [or U_m]
$a_{t_n} \$ [or $a_{u_m} \$ ]	"on-site travel": distance(s) covered "around" T_n [or U_m] point
$b \$ [or $b_k \$ ]	distance covered between T₁ and U₁ [or k-th distance between some T and/or U points]
$\sum_{i=1}^k b_i \$	sum of all k distances covered between all T and U points
$w_{t_n} \$ [or $w_{u_m} \$ ]	weight
$r_{t_1} = 2d_{t_1}+a_{t_1} \$	the shortest or most efficient return trip distance from S to T₁
$r_{t_1+u_1} = d_{t_1}+a_{t_1}+d_{u_1}+a_{u_1}+b \$	combined return trip distance from S to T₁ and U₁ points
$\begin{align} r_{t_1-u_1} & = \frac {w_{t_1}(d_{t_1}+a_{t_1})r_{t_1+u_1}} {w_{t_1}(d_{t_1}+a_{t_1})+w_{u_1}(d_{u_1}+a_{u_1})} = \\ & = \frac {w_{t_1}(d_{t_1}+a_{t_1})(d_{t_1}+a_{t_1}+d_{u_1}+a_{u_1}+b)} {w_{t_1}(d_{t_1}+a_{t_1})+w_{u_1}(d_{u_1}+a_{u_1})} \\ \end{align}$	adjusted return trip distance from S to T₁ (with U₁ substracted)
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$r_{t_n-u_n} =$