论文信息 - Sur le 2-groupe des classes d'idéaux des corps quadratiques.

Sur le 2-groupe des classes d'idéaux des corps quadratiques.

An ultrasonic nondestructive testing system and a search unit for use in such a system are disclosed herein. A method of manufacturing such a search unit is also disclosed. The search unit 10 includes a transducer crystal 36 for transmitting and receiving ultrasonic energy and a backing structure 60 behind the transducer crystal for dampening the crystal 36 against ringing and for attenuating any spurious ultrasonic energy radiated from the backside of the transducer crystal.

Pierre Kaplan | P. Kaplan

[1] W. Waterhouse. Pieces of eight in class groups of quadratic fields , 1973 .

[2] Ezra Brown. Discriminantal divisors and binary quadratic forms , 1972, Glasgow Mathematical Journal.

[3] E. Lehmer. On some special quartic reciprocity laws , 1972 .

[4] Ezra Brown. Quadratic forms and biquadratic reciprocity. , 1972 .

[5] Georges Gras. Sur les l-classes d'idéaux dans les extensions cycliques relatives de degré premier l , 1972 .

[6] Ezra Brown. Representations of Discriminantal Divisors by Binary Quadratic Forms. , 1971 .

[7] Daniel Shanks. Gauss’s ternary form reduction and the 2-Sylow subgroup , 1971 .

[8] G. Pall. Discriminantal divisors of binary quadratic forms , 1969 .

[9] F. Tano. Sur quelques théorèmes de Dirichlet. , 1889 .