circuits electrics amb resistències y condensadors

( R_{1}+...+R_{n} )·d_{t}[q(t)] + ( a_{1}+...+a_{n} )·q(t) = V(t)


( (1/R_{1})+...+(1/R_{n}) )^{(-1)}·d_{t}[q(t)] + ( (1/a_{1})+...+(1/a_{n}) )^{(-1)}·q(t) = V(t)


( ∑ R_{j} )·( ∑ (1/R_{k}) )·( ∑ R_{i} )·d_{t}[q(t)] + ...
... ( ∑ a_{j} )·( ∑ (1/a_{k}) )·( ∑ a_{i} )·q(t) = V(t)


( ( ∑ (1/R_{j}) )·( ∑ R_{k} )·( ∑ (1/R_{i}) ) )^{(-1)}·d_{t}[q(t)] + ...
... ( ( ∑ (1/a_{j}) )·( ∑ a_{k} )·( ∑ (1/a_{i}) ) )^{(-1)}·q(t) = V(t)