Right examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword @precise), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword @allsorted), the subsets are complements of one another.

Many but not all right examples require nontrivial mathematical knowledge to solve (keyword @math).

Right examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword @precise), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword @allsorted), the subsets are complements of one another.

Many but not all left examples involve nontrivial mathematical knowledge to solve (keyword @math).

Left examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword @precise), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword @allsorted), the subsets are complements of one another.

Many but not all left examples involve nontrivial mathematical knowledge to solve (keyword @math).

BP200 is a version of this with sides flipped, sorting pictures of Bongard Problems (miniproblems) instead of @links to pages on the OEBP, and with emphasis on feature-based solutions as an alternative to number-based solutions.

Left examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword @exact), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword @allsorted), the subsets are complements of one another.

Many but not all left examples involve nontrivial mathematical knowledge to solve (keyword @math).

BP200 is a version of this with sides flipped, sorting pictures of Bongard Problems (miniproblems) instead of @links to pages on the OEBP, and with emphasis on feature-based solutions as the opposite of number-based solutions.

BP200 is a version of this with sides flipped, with pictures of Bongard Problems instead of links to pages on the OEBP, and with emphasis on feature-based solutions as the opposite of number-based solutions.

Left examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword "exact" left-BP508), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword "allsorted" left-BP509), the subsets are complements of one another.

Many but not all left examples involve nontrivial mathematical knowledge to solve (keyword "math" left-BP571).

Left examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword "exact" left-BP508), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword "wholesort" left-BP509), the subsets are complements of one another.

Many but not all left examples involve nontrivial mathematical knowledge to solve (keyword "math" left-BP571).

Left examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword "exact" left-BP508), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword "whole" left-BP509), the subsets are complements of one another.

Many but not all left examples involve nontrivial mathematical knowledge to solve (keyword "math" left-BP571).

Left examples have the keyword "number" on the OEBP. The solution must only depend on counting the number of something: no comparison between numbers of different things.

When a "number" Bongard Problem sorts numbers unambiguously (keyword "exact" left-BP508), the left side and the right side define disjoint sets of numbers. When a "number" Bongard Problem sorts all numbers (keyword "whole" left-BP509), the subsets are complements of one another.

Many (but not all) left examples involve mathematical understanding to solve.