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BP386 Lower shape can be used as a tile to build the upper one vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP381 BP382 BP383 BP384 BP385  *  BP387 BP388 BP389 BP390 BP391

KEYWORD

nice, precise, allsorted, left-narrow, perfect, pixelperfect, orderedpair, traditional, preciseworld, left-listable, right-listable

CONCEPT tiling (info | search)

AUTHOR

Jago Collins

BP390 Each graph vertex is uniquely defined by its connections (the graph does not admit nontrivial automorphisms) vs. the graph admits nontrivial automorphisms.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP385 BP386 BP387 BP388 BP389  *  BP391 BP392 BP393 BP394 BP395

KEYWORD

precise, allsorted, notso, traditional, preciseworld

CONCEPT graph (info | search),
self-reference (info | search),
topological_transformation (info | search),
imagined_shape (info | search),
imagined_entity (info | search)

WORLD

connected_graph [smaller | same | bigger]

AUTHOR

Jago Collins

BP391 There exists an edge such that removing it yields two disconnected graphs (i.e., the minimum number of edges whose removal results in two disconnected graphs is 1) vs. the minimum number of edges whose removal results in two disconnected graphs is 2.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP386 BP387 BP388 BP389 BP390  *  BP392 BP393 BP394 BP395 BP396

KEYWORD

nice, precise, traditional, preciseworld

CONCEPT graph (info | search),
distinguishing_crossing_curves (info | search),
existence (info | search),
imagined_shape (info | search),
imagined_entity (info | search)

WORLD

connected_graph [smaller | same | bigger]

AUTHOR

Jago Collins

BP557 Equal horizontal length vs. not
(edit; present; nest [left/right]; search; history)
COMMENTS

All examples in this Problem are pairs of straight line segments.


This problem communicates the idea of projected distance, in this case from 2D to 1D (x-axis).

CROSSREFS

Adjacent-numbered pages:
BP552 BP553 BP554 BP555 BP556  *  BP558 BP559 BP560 BP561 BP562

KEYWORD

nice, precise, allsorted, stretch, perfect, unorderedpair, preciseworld

CONCEPT projection (info | search)

WORLD

two_segments [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP558 Point sequence that is increasing or decreasing in height vs. point sequence that alternates in height
(edit; present; nest [left/right]; search; history)
COMMENTS

All examples in this Problem are groups of 3 dots.


Any example where 2 adjacent dots have the same height would be ambiguously sorted.

CROSSREFS

Adjacent-numbered pages:
BP553 BP554 BP555 BP556 BP557  *  BP559 BP560 BP561 BP562 BP563

EXAMPLE

Reading from right to left in the first box on the left hand side: the 2nd dot is higher than the 1st, and the 3rd is higher than the 2nd, so the sequence of dots is strictly increasing in height.

KEYWORD

nice, precise, antihuman, orderedtriplet, preciseworld

CONCEPT coordinate (info | search)

WORLD

three_points [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP560 There exists a closed trail that hits each edge exactly once vs. not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Left examples are called "Eulerian graphs."


A connected graph is Eulerian if and only if each vertex is incident to an even number of edges.

CROSSREFS

Adjacent-numbered pages:
BP555 BP556 BP557 BP558 BP559  *  BP561 BP562 BP563 BP564 BP565

KEYWORD

precise, allsorted, math, traditional, preciseworld

CONCEPT graph (info | search),
distinguishing_crossing_curves (info | search),
all (info | search),
even_odd (info | search),
existence (info | search)

WORLD

connected_graph [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP569 Triangular number of dots vs. non-triangular number of dots
(edit; present; nest [left/right]; search; history)
COMMENTS

All examples in this Problem are groups of black dots.


The nth triangular number is the sum over the natural numbers from 1 to n, where n > 0. Note: 0 is the 0th triangular number. The first few triangular numbers are 0, 1, 3 (= 1+2) and 6 (= 1+2+3)

CROSSREFS

Adjacent-numbered pages:
BP564 BP565 BP566 BP567 BP568  *  BP570 BP571 BP572 BP573 BP574

KEYWORD

nice, precise, allsorted, notso, number, math, left-narrow, left-null, help, preciseworld

WORLD

dots [smaller | same | bigger]

AUTHOR

Leo Crabbe

BP576 Vertices may be partitioned into two sets such that no two vertices in the same set are connected versus not so.
(edit; present; nest [left/right]; search; history)
COMMENTS

Left examples are called "bipartite graphs."

CROSSREFS

Adjacent-numbered pages:
BP571 BP572 BP573 BP574 BP575  *  BP577 BP578 BP579 BP580 BP581

KEYWORD

precise, allsorted, notso, math, traditional, preciseworld

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

WORLD

graph [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP788 Graph contains a "loop" a.k.a. cycle (cyclic) versus graph is acyclic.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP783 BP784 BP785 BP786 BP787  *  BP789 BP790 BP791 BP792 BP793

KEYWORD

nice, precise, allsorted, math, traditional, preciseworld

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

WORLD

connected_graph [smaller | same | bigger]

AUTHOR

Aaron David Fairbanks

BP856 Compound shape would hit the dot if rotated vs. not so.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP851 BP852 BP853 BP854 BP855  *  BP857 BP858 BP859 BP860 BP861

KEYWORD

nice, precise, allsorted, left-narrow, preciseworld

CONCEPT imagined_motion (info | search),
collision (info | search)

AUTHOR

Leo Crabbe

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