Wallace C. Koehler

Foreword re C. S. Wallace

One of the second generation of computer scientists, Chris Wallace completed his tertiary education in 1959 with a Ph.D. in nuclear physics, on cosmic ray showers, under Dr Paul George at Sydney University. Needless to say, computer science was not, at that stage, an established academic discipline. With Max Brennan and John Malos he had designed and built a large automatic data logging system ...

William Wallace (1791-1837).

Wallace and Darwin

term the common ancestral state of members of a group); morphology (arguing that the “natural inference of an unprejudiced person” is to recognize that homologous structures “are true records of the progress of the organic world); domestication (maintaining that divergent animal breeds constitute evidence of mutability, and offering thought experiments to show that there is no good reason to th...

Wallace as writer

But despite their differences each man deeply valued the other. Darwin persuaded the British government to award Wallace a pension for services to science. Wallace dedicated his book The Malay Archipelago to Darwin, “as a token of personal esteem and friendship but also to express my deep admiration for his genius and his works.” Wallace also called his 1889 collection of evolutionary essays Da...

Constraint Reaction and the Peach-koehler Force for Dislocation Networks

In the presence of dislocations, the elastic deformation tensor F is not a gradient, but satisfies the condition Curl F = ΛL (with the dislocation density ΛL, a tensor-valued measure concentrated in the dislocation L and F ). Then F ∈ Lp with 1 ≤ p < 2. This peculiarity is at the origin of the mathematical difficulties encountered with dislocations at the mesoscopic scale, which are here modele...