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BP1097 "Fault line" present vs. not
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP1092 BP1093 BP1094 BP1095 BP1096  *  BP1098 BP1099 BP1100 BP1101 BP1102

KEYWORD

nice, precise, notso, left-finite, right-finite, preciseworld

AUTHOR

Jago Collins

BP1099 Considering only the ways they are connected, anything that can be said about a given node can be said about every other node vs. not so.
(edit; present; nest [left/right]; search; history)
REFERENCE

https://en.wikipedia.org/wiki/Vertex-transitive_graph

CROSSREFS

Adjacent-numbered pages:
BP1094 BP1095 BP1096 BP1097 BP1098  *  BP1100 BP1101 BP1102 BP1103 BP1104

KEYWORD

precise, allsorted, notso, math, preciseworld

CONCEPT graph (info | search),
distinguishing_crossing_curves (info | search)

WORLD

graph [smaller | same | bigger]
zoom in left

AUTHOR

Leo Crabbe

BP1109 Considering only the ways they are connected, anything that can be said about a given edge can be said about every other edge vs. not so.
(edit; present; nest [left/right]; search; history)
REFERENCE

https://mathworld.wolfram.com/Edge-TransitiveGraph.html

CROSSREFS

Adjacent-numbered pages:
BP1104 BP1105 BP1106 BP1107 BP1108  *  BP1110 BP1111 BP1112 BP1113 BP1114

KEYWORD

precise, allsorted, notso, math, left-narrow, preciseworld

CONCEPT graph (info | search),
distinguishing_crossing_curves (info | search)

WORLD

graph [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP1116 Contains self somewhere within any area around any point within self vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Very similar to the less clearly-defined solution "tiles itself with infinitely many copies (different sizes allowed) vs. does not".


The left hand side of this is a weaker condition than the left hand side of BP1241.

CROSSREFS

Adjacent-numbered pages:
BP1111 BP1112 BP1113 BP1114 BP1115  *  BP1117 BP1118 BP1119 BP1120 BP1121

KEYWORD

notso, perfect, infinitedetail

CONCEPT topological_density (info | search),
fractal (info | search),
recursion (info | search),
self-reference (info | search)

WORLD

connected_fractal [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP1138 Each attribute is shared by every group or none vs. some attribute is shared by exactly two groups
(edit; present; nest [left/right]; search; history)
COMMENTS

Attributes are shading, shape, and number.

There are always three groups.

This problem is related to the card game Set.

CROSSREFS

Adjacent-numbered pages:
BP1133 BP1134 BP1135 BP1136 BP1137  *  BP1139 BP1140 BP1141 BP1142 BP1143

KEYWORD

nice, precise, allsorted, notso, preciseworld

CONCEPT all (info | search),
number (info | search),
same (info | search),
two (info | search),
three (info | search)

AUTHOR

William B Holland

BP1145 Polygon that can be achieved by folding a square once vs. other polygons.
(edit; present; nest [left/right]; search; history)
COMMENTS

Although it is tempting at first to make a version of this Bongard Problem with the solution "Shape can be achieved by folding a square a finite amount of times vs. other shapes", this alternate Bongard Problem would just amount to having the solution "Convex shape with straight edges vs. concave shape or convex shape with at least one curved edge."

CROSSREFS

Adjacent-numbered pages:
BP1140 BP1141 BP1142 BP1143 BP1144  *  BP1146 BP1147 BP1148 BP1149 BP1150

KEYWORD

precise, notso, stretch, left-narrow, finishedexamples, preciseworld

CONCEPT square (info | search)

AUTHOR

Leo Crabbe

BP1147 Columns of the table could be respectively labeled "Number" and "Number of times number appears in this table" vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP1142 BP1143 BP1144 BP1145 BP1146  *  BP1148 BP1149 BP1150 BP1151 BP1152

KEYWORD

nice, precise, notso, handed, leftright, left-narrow, grid, preciseworld, left-listable, right-listable

CONCEPT self-reference (info | search)

AUTHOR

Leo Crabbe

BP1148 Number of dots in the Nth box (from the left) is how many times the number (N - 1) appears in the whole diagram vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Left-sorted examples are sometimes called autobiographical or self-descriptive numbers.

REFERENCE

https://oeis.org/A349595

https://en.wikipedia.org/wiki/Self-descriptive_number

CROSSREFS

See BP1147 for a similar idea.

BP1149 was inspired by this.

Adjacent-numbered pages:
BP1143 BP1144 BP1145 BP1146 BP1147  *  BP1149 BP1150 BP1151 BP1152 BP1153

KEYWORD

nice, precise, unwordable, notso, handed, leftright, left-narrow, sequence, preciseworld, left-listable, right-listable

CONCEPT self-reference (info | search)

AUTHOR

Leo Crabbe

BP1149 Number in the Nth box (from the left) is how many numbers appear N times vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Inspired by BP1148.

Adjacent-numbered pages:
BP1144 BP1145 BP1146 BP1147 BP1148  *  BP1150 BP1151 BP1152 BP1153 BP1154

KEYWORD

nice, precise, unwordable, notso, handed, leftright, left-narrow, sequence, preciseworld, left-listable, right-listable

CONCEPT self-reference (info | search)

AUTHOR

Aaron David Fairbanks

BP1157 The order in which the objects in the top half are combined to make the object in the lower half matters vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Operations depicted in right-sorted examples are called "commutative".


"Order matters" here means that if the objects in the top half were to switch places, the output would look different.

REFERENCE

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

CROSSREFS

Adjacent-numbered pages:
BP1152 BP1153 BP1154 BP1155 BP1156  *  BP1158 BP1159 BP1160 BP1161 BP1162

KEYWORD

nice, abstract, unwordable, notso, structure, rules, miniworlds

CONCEPT function (info | search)

AUTHOR

Leo Crabbe

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