The On-Line Encyclopedia of Bongard Problems

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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`

This Bongard Problem vs. anything else.

BP902

BP1

becious

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

	COMMENTS	`Although this Bongard Problem is self-referential, it's only because of the specific phrasing of the solution. "BP902 vs. anything else" would also work. The number 902 could have been chosen coincidentally.`
	CROSSREFS	`See BP953, BP959.` `Adjacent-numbered pages: BP897 BP898 BP899 BP900 BP901 * BP903 BP904 BP905 BP906 BP907`
	KEYWORD	`notso, meta (see left/right), links, left-self, left-narrow, left-finite, left-full, right-null, right-it, invalid, experimental, funny`
	CONCEPT	`self-reference (info \| search),` `specificity (info \| search)`
	WORLD	`everything [smaller \| same] zoom in left (bp902)`
	AUTHOR	`Leo Crabbe`

Nesting vs. no nesting.

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

	CROSSREFS	`See BP1061 for a version of this with only squares and which allows infinite nesting.` `See BP71 for a Problem about counting levels of nesting.` `Adjacent-numbered pages: BP1017 BP1018 BP1019 BP1020 BP1021 * BP1023 BP1024 BP1025 BP1026 BP1027`
	KEYWORD	`easy, nice, precise, allsorted, traditional`
	CONCEPT	`recursion_number (info \| search),` `separated_regions (info \| search),` `inside (info \| search),` `recursion (info \| search)`
	WORLD	`varied_thickness_curves_drawing [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

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