Why is an increase in the temperature of a gas at constant volume and constant pressure not possible?

(N/A) According to the ideal gas equation,$PV = nRT$.
If both pressure $P$ and volume $V$ are kept constant,then the product $PV$ is constant.
Since $n$ (number of moles) and $R$ (universal gas constant) are also constants,the temperature $T$ must remain constant.
Therefore,it is mathematically impossible to increase the temperature $T$ while keeping both $P$ and $V$ constant for a fixed amount of gas.