Direct indefinite integration

Solution by Direct Indefinite Integration after Separation... 

This is exactly the same solution that we had obtained earlier from the Mathematica direct indefinite integration. 

When the medium extend.s to —oo in the s direction and there are no sources along s, it may be convenient not to stop the integration at the point 0 but to continue it indefinitely ... 

As a result of 1, during the same time period the detector supplies a constant output signal S, which is not dependent on flow rate. The peak area A, however, here instead of the integral in 2 simply the product S At, is clearly directly proportional to the time At during which concentration C is kept consta-nt in the detector. If in the centre of the rectangular peak (Fig. 57) the carrier-gas flow is stopped, the detector would issue signal S for an indefinite time A would therefore be of indefinite size. 

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