# RK

RKabbreviation

radial keratotomy

- In obtaining the minor Aik in the form of a determinant we erased certain rows and columns, and we would have erased in an exactly similar manner had we been forming the determinant associated with A2:8, since the deleting lines intersect
**rk**in two pairs of points. - In the latter case the sign is determined by -I raised to the same power as before, with the exception that Tux., replaces Tusk; but if one of these numbers be even the other must be uneven; hence A ik = - Aisï¿½
**rk**Moreover aik a,, aikarsAik +aisarkAis Aik,**rk**aik ars rs where the determinant factor is giyen by the four points in which the deleting lines intersect. - Along the line of flow x'A'P'J', >L =m, u=a'e-
**rk**/"n, and from x' to 41. - M-
**rk**- - Dreio. - Are intersected by the lines
**RK**, RM, RN, we have SA/AX = TP/PQ = SP/PQ, since the angle PST = angle PTS.

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