Dean slept fitfully, once he managed to count sufficient sheep to do so, with dreams and mind games interchanging so rapidly as to blur the borders more than a map of Africa.

Two relations R and R' are said to be ordinally similar, if a one-one relation holds between the members of the two fields of R and R', such that if x and y are any two members of the field of R, such that x has the relation R to y, and if x' and y are the correlates in the field of R' of x and y, then in all such cases x has the relation R' to y', and conversely, interchanging the dashes on the letters, i.e.

This writer seems to differ a good deal from Blith about the advantage of interchanging tillage and pasture.

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Thus to divide by a fractional number we must multiply by the number obtained by interchanging the numerator and the denominator, i.e.