EM4 Digital Electronics Practice Test

In Karnaugh maps, what does wrap-around adjacency mean?

Adjacent cells share a side. The map wraps around edges so edge cells are adjacent. Only diagonal cells are adjacent. There is no wrap-around in Karnaugh maps.

Correct Answer:

The map wraps around edges so edge cells are adjacent.

Explanation:

Wrap-around adjacency means treating the map as if its edges are connected, so edge cells become neighbors with the cells on the opposite edge in the same row or column. This toroidal perspective lets you form groups that cross the boundary, which is key for simplifying the Boolean expression by capturing minterms that differ by only one variable even when they lie on opposite sides of the map. Inside the map, adjacent cells share a side and differ by one variable; wrap-around simply extends that idea to the edges.

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