The research of Jaśkowski on decidability theory of first order sentences (I)
✍ Scribed by Ryszard Kopiecki; Bogdan Saralski; Gerald Waligóra
- Publisher
- Springer Netherlands
- Year
- 1975
- Tongue
- English
- Weight
- 671 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0039-3215
No coin nor oath required. For personal study only.
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## Abstract First‐order phase transitions are modelled by a non‐homogeneous, time‐dependent scalar‐valued order parameter or phase field. The time dependence of the order parameter is viewed as arising from a balance law of the structure order. The gross motion is disregarded and hence the body is
## Abstract A method for the determination of the symmetry of first‐order vectors in Hartree–Fock perturbation theory is developed. This leads to the definition of symmetry‐adapted basis vectors to be employed at first order in the perturbation. It is shown that computer time can be saved, to some
## Abstract A method is described whereby molecular symmetry is employed to reduce the number of two‐electron integrals in perturbed Hartree–Fock calculations of second‐order properties. The method is a generalization of the Dacre–Elder procedure. First‐ and second‐rank perturbing tensor operators