The On-Line Encyclopedia of Bongard Problems

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BP853

Prime knot vs. composite knot.

(edit; present; nest [left/right]; search; history)

	REFERENCE	`https://en.wikipedia.org/wiki/Prime_knot`
	CROSSREFS	`Adjacent-numbered pages: BP848 BP849 BP850 BP851 BP852 * BP854 BP855 BP856 BP857 BP858`
	KEYWORD	`math, hardsort`
	CONCEPT	`knot (info \| search)`
	WORLD	`knot [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP852

Object shown below is the "limit" of the sequence above (end result after "infinite time") versus not so.

(edit; present; nest [left/right]; search; history)

	COMMENTS	`The conceptual limit of the sequence may not be the limit of the points in the image. For example in a sequence of halvings the limit value is never reached, so the bottom would never change color and thus its limit would not would not either.` `Sequences progress from left to right (and there is not usually a way to intuitively extend the sequence in the other direction).`
	CROSSREFS	`Adjacent-numbered pages: BP847 BP848 BP849 BP850 BP851 * BP853 BP854 BP855 BP856 BP857`
	KEYWORD	`notso, creativeexamples, perfect, infinitedetail, assumesfamiliarity, structure, contributepairs, rules`
	AUTHOR	`Aaron David Fairbanks`

BP851

Figure with points (small white circles) can be smoothly deformed within the 2D plane without passing through itself so that all points touch to make the other figure vs. not so (movement out of the plane required).

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`All examples here fit left in BP369, a version where the figure is allowed to pass through itself while being deformed.` `Adjacent-numbered pages: BP846 BP847 BP848 BP849 BP850 * BP852 BP853 BP854 BP855 BP856`
	KEYWORD	`math, traditional`
	CONCEPT	`topological_transformation (info \| search)`
	WORLD	`figure_made_of_curves_and_quotient_by_hollow_dots [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP850

Shape can be maneuvered around the corner vs. not so.

(edit; present; nest [left/right]; search; history)

	REFERENCE	`https://en.wikipedia.org/wiki/Moving_sofa_problem`
	CROSSREFS	`Adjacent-numbered pages: BP845 BP846 BP847 BP848 BP849 * BP851 BP852 BP853 BP854 BP855`
	KEYWORD	`nice, precise, physics, creativeexamples, proofsrequired, left-narrow, right-narrow, dithering`
	CONCEPT	`rotation_required (info \| search),` `imagined_motion (info \| search),` `physically_fitting (info \| search)`
	AUTHOR	`Leo Crabbe`

BP849

Loop is time-symmetrical (loop is like ABCBABCBA... instead of like ABCABCABC...) up to rotation of object vs. not so (neither up to rotation nor reflection).

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Adjacent-numbered pages: BP844 BP845 BP846 BP847 BP848 * BP850 BP851 BP852 BP853 BP854`
	KEYWORD	`hard, convoluted, solved, rules`
	WORLD	`constant_change_seq_loop_right [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP848

Lower bound object shown vs. not so.

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Adjacent-numbered pages: BP843 BP844 BP845 BP846 BP847 * BP849 BP850 BP851 BP852 BP853`
	KEYWORD	`creativeexamples, structure, contributepairs, rules`
	WORLD	`constant_change_seq_increase_right_low_bound_obj [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

BP847

Evokes the idea of symmetry vs. not so.

(edit; present; nest [left/right]; search; history)

	COMMENTS	`Or, perhaps more concretely, "Depiction of object with some symmetry (invariance under transformation) vs. depiction of object with no simple symmetries."`
	CROSSREFS	`Adjacent-numbered pages: BP842 BP843 BP844 BP845 BP846 * BP848 BP849 BP850 BP851 BP852`
	KEYWORD	`nice, fuzzy, abstract, math, concept, collective, dithering`
	CONCEPT	`symmetry (info \| search)`
	AUTHOR	`Leo Crabbe`

BP846

A quantity increases by fixed constant amount each step vs. not so.

(edit; present; nest [left/right]; search; history)

	CROSSREFS	`Adjacent-numbered pages: BP841 BP842 BP843 BP844 BP845 * BP847 BP848 BP849 BP850 BP851`
	KEYWORD	`creativeexamples, structure, contributepairs, rules`
	WORLD	`quantity_change_seq_increase_right [smaller \| same \| bigger] zoom in right (constant_change_seq_increase_right)`
	AUTHOR	`Aaron David Fairbanks`

BP845

"Noisy" properties changing independent of the consistently increasing quantity vs. not so.

(edit; present; nest [left/right]; search; history)

	COMMENTS	`"Noisy" sequences of change vs. "minimalist" sequences of change.`
	CROSSREFS	`See BP511 for noise in BPs.` `See BP827 for noise in images of BPs.` `Adjacent-numbered pages: BP840 BP841 BP842 BP843 BP844 * BP846 BP847 BP848 BP849 BP850`
	KEYWORD	`creativeexamples, structure, contributepairs, rules`
	WORLD	`quantity_change_seq_increase_right_noise_allowed [smaller \| same \| bigger] zoom in right (quantity_change_seq_increase_right)`
	AUTHOR	`Aaron David Fairbanks`

BP844

Cars vs. no cars

(edit; present; nest [left/right]; search; history)

	COMMENTS	`Based on Google reCaptcha human verification checks.`
	CROSSREFS	`Adjacent-numbered pages: BP839 BP840 BP841 BP842 BP843 * BP845 BP846 BP847 BP848 BP849`
	KEYWORD	`nice, teach, anticomputer, culture, color, experimental, funny`
	WORLD	`color_street_photograph [smaller \| same \| bigger]`
	AUTHOR	`Cameron Fetter`

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