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BP1146 Same number of dots in top row as in leftmost column vs not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

This is a difficult-to-read attempt at making a Bongard Problem about perfect numbers. Grouping columns together to make rectangular arrays, each maximal (most dots possible) rectangular array of a particular height in any given example has the same number of dots in it (a perfect number, in left-sorted cases), and the dot-width of each array represents a particular divisor of that number.


It is not currently known whether there are a finite amount of examples that would be sorted left.


Every example in this Bongard Problem corresponds to a distinct natural number. There is not a way of representing the number 1 using the rules of construction for examples in this problem (if the problem were simply "Perfect number of dots vs. other number of dots", the example with 1 dot would be sorted right).

REFERENCE

https://en.wikipedia.org/wiki/Perfect_number

CROSSREFS

Adjacent-numbered pages:
BP1141 BP1142 BP1143 BP1144 BP1145  *  BP1147 BP1148 BP1149 BP1150 BP1151

KEYWORD

overriddensolution, left-listable, right-listable

AUTHOR

Leo Crabbe

BP1137 Constructible Polygon vs. Non-constructible Polygon
(edit; present; nest [left/right]; search; history)
REFERENCE

https://en.wikipedia.org/wiki/Straightedge_and_compass_construction


https://en.wikipedia.org/wiki/Constructible_polygon

CROSSREFS

Adjacent-numbered pages:
BP1132 BP1133 BP1134 BP1135 BP1136  *  BP1138 BP1139 BP1140 BP1141 BP1142

KEYWORD

stub, precise, math, hardsort, proofsrequired, preciseworld

AUTHOR

Jago Collins

BP1055 Equidiagonal quadrilaterals vs. non-equidiagonal quadrilaterals
(edit; present; nest [left/right]; search; history)
REFERENCE

https://en.wikipedia.org/wiki/Equidiagonal_quadrilateral

CROSSREFS

Adjacent-numbered pages:
BP1050 BP1051 BP1052 BP1053 BP1054  *  BP1056 BP1057 BP1058 BP1059 BP1060

KEYWORD

hard, antihuman

WORLD

fill_quadrilateral [smaller | same | bigger]

AUTHOR

Jago Collins

BP1095 Angle of incidence equals angle of reflection vs. not
(edit; present; nest [left/right]; search; history)
REFERENCE

https://en.wikipedia.org/wiki/Specular_reflection

https://en.wikipedia.org/wiki/Snooker

CROSSREFS

Adjacent-numbered pages:
BP1090 BP1091 BP1092 BP1093 BP1094  *  BP1096 BP1097 BP1098 BP1099 BP1100

KEYWORD

easy, nice, precise, allsorted, physics, perfect

AUTHOR

Jago Collins

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