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In Sean Carroll's GR book I found the following statement:
there is no simple map between classical and quantum theories,
- there are classical theories with no quantum counterpart
- classical theories with multiple quantum versions
- quantum theories without any classical analogue
Could someone give me examples to each of the three cases?
thanks
there is no simple map between classical and quantum theories,
- there are classical theories with no quantum counterpart
- classical theories with multiple quantum versions
- quantum theories without any classical analogue
Could someone give me examples to each of the three cases?
thanks