The On-Line Encyclopedia of Bongard Problems

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Triangles vs. quadrangles.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 245.`
	CROSSREFS	`Adjacent-numbered pages: BP91 BP92 BP93 BP94 BP95 * BP97 BP98 BP99 BP100 BP101`
	KEYWORD	`number, finished, traditional, bongard`
	CONCEPT	`collinear (info \| search),` `line_or_curve_endpoint (info \| search),` `number (info \| search),` `imagined_shape (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Mikhail M. Bongard`

Triangles vs. quadrangles.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 246.`
	CROSSREFS	`Adjacent-numbered pages: BP93 BP94 BP95 BP96 BP97 * BP99 BP100 BP101 BP102 BP103`
	KEYWORD	`easy, nice, noisy, number, finished, traditional, bongard`
	CONCEPT	`number (info \| search)`
	AUTHOR	`Mikhail M. Bongard`

Three simple lines vs. three complex lines.

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	CROSSREFS	`Adjacent-numbered pages: BP102 BP103 BP104 BP105 BP106 * BP108 BP109 BP110 BP111 BP112`
	KEYWORD	`number, traditional`
	CONCEPT	`number (info \| search),` `curve_texture (info \| search),` `texture (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Four out of five objects are circles vs. never four out of five objects are circles.

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	CROSSREFS	`Adjacent-numbered pages: BP105 BP106 BP107 BP108 BP109 * BP111 BP112 BP113 BP114 BP115`
	KEYWORD	`number, traditional`
	CONCEPT	`number (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Odd number of squares vs. even number of squares.

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	CROSSREFS	`Adjacent-numbered pages: BP145 BP146 BP147 BP148 BP149 * BP151 BP152 BP153 BP154 BP155`
	KEYWORD	`number, traditional`
	CONCEPT	`even_odd (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Even number vs. odd number.

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	CROSSREFS	`See BP334 for a version of the same idea, but using dots instead of arbitrary shapes.` `Adjacent-numbered pages: BP197 BP198 BP199 BP200 BP201 * BP203 BP204 BP205 BP206 BP207`
	KEYWORD	`noisy, number, traditional`
	CONCEPT	`even_odd (info \| search)`
	AUTHOR	`Giuseppe Insana`

Prime number vs. composite number.

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	CROSSREFS	`Adjacent-numbered pages: BP198 BP199 BP200 BP201 BP202 * BP204 BP205 BP206 BP207 BP208`
	KEYWORD	`noisy, number, math`
	CONCEPT	`prime (info \| search)`
	AUTHOR	`Giuseppe Insana`

Five vs. four.

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	CROSSREFS	`Adjacent-numbered pages: BP199 BP200 BP201 BP202 BP203 * BP205 BP206 BP207 BP208 BP209`
	KEYWORD	`noisy, number, traditional`
	CONCEPT	`number (info \| search)`
	AUTHOR	`Giuseppe Insana`

Box divided into six areas vs. box divided into four areas.

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	CROSSREFS	`Adjacent-numbered pages: BP227 BP228 BP229 BP230 BP231 * BP233 BP234 BP235 BP236 BP237`
	KEYWORD	`arbitrary, number, traditional`
	CONCEPT	`number (info \| search)`
	AUTHOR	`Giuseppe Insana`

One object vs. two or more objects.

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	CROSSREFS	`Adjacent-numbered pages: BP272 BP273 BP274 BP275 BP276 * BP278 BP279 BP280 BP281 BP282`
	KEYWORD	`number`
	CONCEPT	`number (info \| search)`
	WORLD	`arial_font_symbols [smaller \| same \| bigger]`
	AUTHOR	`Merse E. Gáspár`

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