Left-sorted Problems have the keyword "left-listable" on the OEBP.

All the possible left examples for the BPs on the left side of this problem could be listed in one infinite sequence. Right examples here are Problems for which no such sequence can exist.

Note that this is not just BP940 (@right-listable) flipped.

I think a BP like BP329 (regular polygon vs. other polygon) is an ambiguous case. There could be uncountably many distinct images featuring resizings and repositionings of one regular polygon. It hasn't been made clear what images should be considered "the same thing" in this context. (Especially in this case, since two distinct images of a square appear on the left hand side.) - Aaron David Fairbanks, Apr 15 2022

See BP515 (keyword @left-finite), which distinguishes between finite left side and infinite left side.

Left-sorted Problems have the keyword "left-listable" on the OEBP.

All the possible left examples for the BPs on the left side of this problem could be listed in one infinite sequence. Right examples here are Problems for which no such sequence can exist.

Note that this is not just BP940 flipped.

I think a BP like BP329 (regular polygon vs. other polygon) is an ambiguous case. There could be uncountably many distinct images featuring resizings and repositionings of one regular polygon. It hasn't been made clear what images should be considered "the same thing" in this context. (Especially in this case, since two distinct images of a square appear on the left hand side.) - Aaron David Fairbanks, Apr 15 2022

Left-sorted Problems have the keyword "left-listable" on the OEBP.

All the possible left examples for the BPs on the left side of this problem could be listed in one infinite sequence. Right examples here are Problems for which no such sequence can exist.

Note that this is not just BP940 flipped.

I think a BP like BP329 (image features regular polygon vs. other polygon) is an ambiguous case. There could be uncountably many distinct images featuring resizings and repositionings of one regular polygon. It hasn't been made clear when images should be considered "the same thing" in this context. (Especially in this case, since two distinct images of a square appear on the left hand side.) - Aaron David Fairbanks, Apr 15 2022

Left-sorted Problems have the keyword "left-listable" on the OEBP.

All the possible left examples for the BPs on the left side of this problem could be listed in one infinite sequence. Right examples here are Problems for which no such sequence can exist.

Note that this is not just BP940 flipped.

I think it is ambiguous whether a BP like BP329 (image features regular polygon vs. other polygon) is "left-listable" or not. There could be uncountably many distinct images featuring resizings and repositionings of the same regular polygon. It hasn't been made clear when images should be considered "the same thing" in the context of that BP. - Aaron David Fairbanks, Apr 15 2022

Bongard Problems such that there is an intuitive way of making an infinite list of all relevant possible left-sorted examples vs. Bongard Problems where there is no such way of listing all left-sorted examples.

Left-sorted Problems have the keyword "left-listable" on the OEBP.

All the possible left examples for the BPs on the left side of this problem could be listed in one infinite sequence. Right examples here are Problems for which no such sequence can exist.

Note that this is not just BP940 flipped.

Bongard Problems with a countably infinite number of relevant possible left examples vs. Bongard Problems with an uncountably infinite number of relevant possible left examples

See BP515 (keyword "left-finite"), which distinguishes between finite left side and infinite left side.

All the possible left examples for the BPs on the left side of this problem could be listed in one infinite sequence. Right examples here are Problems for which no such sequence can exist.

Note that this is not just BP940 flipped.

Left examples have the keyword "+countablyinfinite" on the OEBP.

Right examples have the keyword "+uncountable" on the OEBP.

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All possible left examples for the BPs on the left side of this problem could be generated by a finite algorithm. Right examples here are Problems for which no such algorithm can exist.

Note that this is not just BP940 flipped.

BPs are sorted based on how BP513 would sort them were they flipped; see that page for a description.

Left examples have the keyword "+countablyinfinite" on the OEBP.

Right examples have the keyword "+uncountable" on the OEBP.

⠀

All possible left examples for the BPs on the left side of this problem could be generated by a finite algorithm. Right examples here are Problems for which no such algorithm can exist.

Note that this is not just BP940 flipped.