Our short dozen of Aristophanic dramas may be taken to represent the fittest among the hundreds of other comedies which have perished.

Tchernuishevski presented and criticised John Stuart Mill's “Political Economy,” the æsthetic criticism of the Gogolian period, the party quarrels in France during the Restoration, Lessing and his age, etc., treated with the same superiority subjects of widely different kinds, but had his principal interests centred on the solution of certain great social problems,—the arrangement of the relations between the sexes, the abolition of serfdom, the abrogation of all individual property in land for the good of the community.

Sometimes, instead of using the variation of parameters technique, it is easier to use the so-called annihilator method (also called the method of undetermined coefficients). We now discuss this annihilator method for solving equations of the form (3.48) y+𝛼y^{𝛥+𝛽y=f(t),} where 𝛼 and 𝛽 are constants and f is a function that can be annihilated as defined below.

Slowly she turned round and faced towards a neat white bungalow, set some way back from the path behind a low hedge of golden privet. No light showed, but someone there was playing the piano. The strange elusiveness of the soft, insistent melody seemed to draw her forward.