12Lxx Connections with logic
- 12L05 Decidability, See also {03B25}
- 12L10 Ultraproducts, See also {03C20}
- 12L12 Model theory, See also {03C60}
- 12L15 Nonstandard arithmetic, See also {03H15}
- 12L99 None of the above but in this section
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