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BP863 Two shapes can tessellate the plane together vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP858 BP859 BP860 BP861 BP862  *  BP864 BP865 BP866 BP867 BP868

KEYWORD

nice, precise, allsorted, math, hardsort, creativeexamples, unorderedpair

CONCEPT infinite_plane (info | search),
tessellation (info | search),
tiling (info | search)

WORLD

2_shapes [smaller | same | bigger]

AUTHOR

Leo Crabbe

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

BP11 Thin and elongated vs. compact.
(edit; present; nest [left/right]; search; history)
COMMENTS

All examples in this Bongard Problem are shape outlines.

REFERENCE

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 217.

CROSSREFS

Adjacent-numbered pages:
BP6 BP7 BP8 BP9 BP10  *  BP12 BP13 BP14 BP15 BP16

KEYWORD

nice, fuzzy, spectrum, stretch, stable, world, finished, traditional, bongard

CONCEPT elongated_compact (info | search)

WORLD

shape_outline [smaller | same | bigger]
zoom in left (elongated_outline)

AUTHOR

Mikhail M. Bongard

BP38 Triangle larger than circle vs. triangle smaller than circle.
(edit; present; nest [left/right]; search; history)
REFERENCE

M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 226.

CROSSREFS

Adjacent-numbered pages:
BP33 BP34 BP35 BP36 BP37  *  BP39 BP40 BP41 BP42 BP43

KEYWORD

spectrum, finished, orderedpair, traditional, continuous, viceversa, bongard

CONCEPT size (info | search),
triangle (info | search),
quantity_comparison (info | search)

WORLD

one_circle_outline_one_triangle_outline_nest [smaller | same | bigger]

AUTHOR

Mikhail M. Bongard

BP341 Strictly increasing or strictly decreasing border line vs. both increasing and decreasing border line.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP336 BP337 BP338 BP339 BP340  *  BP342 BP343 BP344 BP345 BP346

KEYWORD

math, perfect, pixelperfect, traditional

CONCEPT size_increase_decrease (info | search),
or (info | search),
outlined_filled (info | search),
tracing_line_or_curve (info | search),
texture (info | search)

WORLD

function_graph_black_below_white_above [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP389 Loops are entangled (in 3-D) vs. loops can be separated (in 3-D).
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP384 BP385 BP386 BP387 BP388  *  BP390 BP391 BP392 BP393 BP394

KEYWORD

nice, precise, allsorted, contributepairs, traditional

CONCEPT knot (info | search),
topological_transformation (info | search),
imagined_motion (info | search),
motion (info | search)

WORLD

link_two_knots [smaller | same | bigger]

AUTHOR

Jago Collins

BP131 Dots are vertices of a parallelogram vs. dots are not vertices of a parallelogram.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP126 BP127 BP128 BP129 BP130  *  BP132 BP133 BP134 BP135 BP136

KEYWORD

noisy, traditional

CONCEPT existence (info | search),
length_line_or_curve (info | search),
imagined_line_or_curve (info | search),
imagined_entity (info | search)

AUTHOR

Douglas R. Hofstadter

BP991 Can be arranged with multiple copies of itself to form some convex shape vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

This is a generalization of BP820.

Adjacent-numbered pages:
BP986 BP987 BP988 BP989 BP990  *  BP992 BP993 BP994 BP995 BP996

KEYWORD

precise, allsorted, perfect

CONCEPT tiling (info | search)

WORLD

fill_shape [smaller | same | bigger]
zoom in left

AUTHOR

Leo Crabbe

BP259 Two identical overlapping objects of which the top is rotated slightly clockwise vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP254 BP255 BP256 BP257 BP258  *  BP260 BP261 BP262 BP263 BP264

KEYWORD

traditional

CONCEPT turn_orientation (info | search),
rotation_required (info | search),
objects_overlap (info | search),
overlap (info | search),
same_shape (info | search),
same (info | search)

AUTHOR

Andreas Gunnarsson

BP126 One large and one small object vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP121 BP122 BP123 BP124 BP125  *  BP127 BP128 BP129 BP130 BP131

KEYWORD

traditional

CONCEPT number (info | search),
separation_of_joined_objects (info | search),
size (info | search)

AUTHOR

Douglas R. Hofstadter

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