Ideas from 'Realism, Mathematics and Modality' by Hartry Field , by Theme Structure
[found in 'Realism, Mathematics and Modality' by Field,Hartry [Blackwell 1989,0-631-16303-4]].
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6. Mathematics / C. Sources of Mathematics / 9. Fictional Mathematics
Fictionalists say 2+2=4 is true in the way that 'Oliver Twist lived in London' is true