User:CrZTgR/T.Fund

$d_{t_{n}}\$ [or $d_{u_{m}}\$]	the shortest or most efficient distance from S to Tn [or Um]
$a_{t_{n}}\$ [or $a_{u_{m}}\$]	"on-site travel": distance(s) covered "around" Tn [or Um] 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
${\begin{aligned}r_{t_{1}-u_{1}}&={\frac {w_{t_{1}}(d_{t_{1}}+a_{t_{1}})r_{t_{1}+u_{1}}}{w_{t_{1}}(d_{t_{1}}+a_{t_{1}})+w_{u_{1}}(d_{u_{1}}+a_{u_{1}})}}=\\&={\frac {w_{t_{1}}(d_{t_{1}}+a_{t_{1}})(d_{t_{1}}+a_{t_{1}}+d_{u_{1}}+a_{u_{1}}+b)}{w_{t_{1}}(d_{t_{1}}+a_{t_{1}})+w_{u_{1}}(d_{u_{1}}+a_{u_{1}})}}\\\end{aligned}}$	adjusted return trip distance from S to T1 (with U1 substracted)
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$r_{t_{n}-u_{n}}=$