The On-Line Encyclopedia of Bongard Problems

Search: concept:iff

Displaying 1-4 of 4 results found.

page 1

Sort: id Format: long Filter: (all | no meta | meta) Mode: (words | no words)

BP146

A shape contains a square if and only if it is a circle vs. a shape contains a square if and only if it is a triangle.

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

	CROSSREFS	`Adjacent-numbered pages: BP141 BP142 BP143 BP144 BP145 * BP147 BP148 BP149 BP150 BP151`
	KEYWORD	`traditional`
	CONCEPT	`iff (info \| search),` `inside (info \| search),` `triangle (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

BP227

Dots touch each other if and only if no large region touches the edges of the box vs. dots dont touch each other if and only if no large region touches the edges of the box.

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

	CROSSREFS	`Adjacent-numbered pages: BP222 BP223 BP224 BP225 BP226 * BP228 BP229 BP230 BP231 BP232`
	KEYWORD	`convoluted, traditional`
	CONCEPT	`iff (info \| search),` `near_far (info \| search)`
	AUTHOR	`Giuseppe Insana`

BP290

If any non-nosed faces exist, they are happy if and only if happy nosed faces exist as well vs. not so.

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

	CROSSREFS	`Adjacent-numbered pages: BP285 BP286 BP287 BP288 BP289 * BP291 BP292 BP293 BP294 BP295`
	KEYWORD	`convoluted`
	CONCEPT	`existence (info \| search),` `iff (info \| search)`
	AUTHOR	`"Lewis"`

BP1082

Shapes are congruent if (and only if) they are enclosed in the same space vs. not so.

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

	CROSSREFS	`Adjacent-numbered pages: BP1077 BP1078 BP1079 BP1080 BP1081 * BP1083 BP1084 BP1085 BP1086 BP1087`
	KEYWORD	`stub, precise, allsorted`
	CONCEPT	`iff (info \| search)`
	AUTHOR	`Leo Crabbe`

page 1

		Hints
(Greetings from The On-Line Encyclopedia of Bongard Problems!)