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BP892 Black shapes can be arranged such that they fit inside rectangular outline vs. not so.
?
(edit; present; nest [left/right]; search; history)
COMMENTS

There is a slight ambiguity here regarding whether a shape could be placed within another shape's hole. This is a question of how one perceives the Problem: are we sliding shapes around on a table in 2D or are we allowed to 'lift' them in 3D space?

CROSSREFS

Adjacent-numbered pages:
BP887 BP888 BP889 BP890 BP891  *  BP893 BP894 BP895 BP896 BP897

KEYWORD

nice, precise, perfect, pixelperfect, help

CONCEPT rotation_required (info | search),
physically_fitting (info | search)

AUTHOR

Leo Crabbe

BP893 As one quantity increases an equally obvious opposite quantity decreases vs. there is only one obvious quantity, which increases as the sequence progresses right.
(edit; present; nest [left/right]; search; history)
COMMENTS

Another way of phrasing the solution: "Neither direction would more naturally be called increase in quantity vs. rightward progression would be called an increase."


Most right examples shown are unboundedly increasing, since finite sequences showing a quantity increasing usually also suggest "distance to end of sequence" as a decreasing opposite quantity. Even so, there are some finite sequences with one direction more intuitively increase-like than the other.

CROSSREFS

Adjacent-numbered pages:
BP888 BP889 BP890 BP891 BP892  *  BP894 BP895 BP896 BP897 BP898

KEYWORD

creativeexamples, structure, rules

WORLD

constant_change_seq_increase_right [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP896 Filled completely by fluid poured into gap (assuming there is already air) vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

For a non-physics-based solution, "there exists a never-vertically-increasing path starting from the opening to each point in the interior vs. not so." - Aaron David Fairbanks, Aug 01 2020

CROSSREFS

Adjacent-numbered pages:
BP891 BP892 BP893 BP894 BP895  *  BP897 BP898 BP899 BP900 BP901

KEYWORD

nice, handed, updown, physics

CONCEPT liquid_flow (info | search),
gravity (info | search)

WORLD

[smaller | same | bigger]

AUTHOR

Zane Fry

BP897 Wide angles connected to narrow angles vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Another solution is that right examples can be folded down flat onto one isosceles triangle while left examples cannot.

All examples in this Problem feature four isosceles triangles connected by corners and/or edges.

CROSSREFS

This was conceived as a false solution for BP898.

Adjacent-numbered pages:
BP892 BP893 BP894 BP895 BP896  *  BP898 BP899 BP900 BP901 BP902

KEYWORD

precise, allsorted, notso, traditional, preciseworld

CONCEPT triangle (info | search)

WORLD

[smaller | same | bigger]

AUTHOR

Molly C Klenzak, Aaron David Fairbanks

BP898 Can fold into tetragonal disphenoid ("isosceles tetrahedron") vs. cannot.
(edit; present; nest [left/right]; search; history)
COMMENTS

Which two sides are the long sides and which side is the short side, or equivalently which angles are the wider angles and which angle is the narrower angle, is the only relevant information to consider for each triangle. Triangles are all assumed isosceles and congruent to one another.


All examples in this Problem feature four of these triangles connected by corners and/or edges.

CROSSREFS

BP897 was conceived as a false solution for this.

Adjacent-numbered pages:
BP893 BP894 BP895 BP896 BP897  *  BP899 BP900 BP901 BP902 BP903

KEYWORD

hard, precise, allsorted, notso, math, preciseworld

CONCEPT triangle (info | search)

WORLD

[smaller | same | bigger]

AUTHOR

Molly C Klenzak

BP899 Regions in drawing (ignore background) can be coloured using three or fewer colours such that no adjacent regions are coloured the same colour vs. four colours are required.
(edit; present; nest [left/right]; search; history)
COMMENTS

This Problem is related to the four colour theorem.

CROSSREFS

Adjacent-numbered pages:
BP894 BP895 BP896 BP897 BP898  *  BP900 BP901 BP902 BP903 BP904

KEYWORD

hard, nice, math

CONCEPT separated_regions (info | search)

WORLD

[smaller | same | bigger]

AUTHOR

Jago Collins

BP900 Black shape is a valid shadow (2D projection) of 3D shape vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP895 BP896 BP897 BP898 BP899  *  BP901 BP902 BP903 BP904 BP905

KEYWORD

3d, orderedpair

CONCEPT 3d_solid (info | search),
projection (info | search)

AUTHOR

Leo Crabbe

BP903 Sharp vs. blurry
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP898 BP899 BP900 BP901 BP902  *  BP904 BP905 BP906 BP907 BP908

KEYWORD

contributepairs

CONCEPT contrast (info | search),
curve_texture (info | search)

AUTHOR

Cameron Fetter

BP904 Rows show all possible ways a certain number of dots can be divided between a certain number of bins vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

The rows in the panels on the right hand side show all the ways you can divide a certain number of dots between a certain number of bins, ignoring which bins they are placed in.

CROSSREFS

Adjacent-numbered pages:
BP899 BP900 BP901 BP902 BP903  *  BP905 BP906 BP907 BP908 BP909

KEYWORD

solved, left-null, grid, left-listable, right-listable

CONCEPT permutation (info | search)

AUTHOR

Molly C Klenzak

BP905 Graph can be redrawn such that no edges intersect vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

A graph is a collection of vertices and edges. Vertices are the dots and edges are the lines that connect the dots. On the left, all edges can be redrawn (curved lines are allowed and moving vertices is allowed) such that no edges cross each other and each vertex is still connected to the same other vertices. These graphs are called planar.

CROSSREFS

Adjacent-numbered pages:
BP900 BP901 BP902 BP903 BP904  *  BP906 BP907 BP908 BP909 BP910

KEYWORD

nice, precise, allsorted, notso, math, left-null, preciseworld

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

WORLD

connected_graph [smaller | same | bigger]

AUTHOR

Molly C Klenzak

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