03Hxx
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- 03H05 Nonstandard models in mathematics [See also 26E35, 28E05, 30G06, 46S20, 47S20, 54J05]
- 03H10 Other applications of nonstandard models (economics, physics, etc.)
- 03H15 Nonstandard models of arithmetic [See also 11U10, 12L15, 13L05]
- 03H99 None of the above, but in this section