Published: 1952 Received: July 20, 1952Available on J-STAGE: August 29, 2006Accepted: -
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Date of correction: August 29, 2006Reason for correction: -Correction: CITATIONDetails: Right : 1) ((pq))=p01q23-p02q13+p03q12+p12q03-p13q02+p23q01. 2) As for the details, reference is to be made to our paper: Takeda, K., On line congruence, I, Tôhoku, 44 (1938), 356-69. 3) As for the details and notations, references are to be made to our paper: Takeda, K., On line congruence, II, Tôhoku, 45 (1938), 103-110. 4) Here we exclude the trivial cases, where the focal surfaces are reduced to special forms, that is, the cases F11=G11=0, F11F22=0 and G11=G22=0. 5) Bompiani, E., Proprietà differenziale caratteristica delle superficie che rappresentano la totalità delle curve piane algebriche di dato ordine, Lincei, 30 (1921), 248-51.
Date of correction: August 29, 2006Reason for correction: -Correction: PDF FILEDetails: -