Why is V(R) < 0 for discharging in RC circuit?
You may get better responces if you provide more information. What is V(R)?
Lacking clarification I will plunge in anyway.... Guessing that V(R) is the voltage across a resistor in an Resistor-Capacitor circuit, and further guessing that the circuit is being both charged and discharged through the same resistor... If one says the voltage is positive across the resistor when charging, it must be negative when discharging because the end of the resistor that _was_ positive must be switched to something that has a lower voltage than the charge on the capacitor in order to discharge it.
If there was an easy way to draw circuit diagrams I would do it and then what I'm trying to say would be fairly obvious, but I'm to lazy to figure it out...
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