| 摘要 |
A dice-shaped learning means for combination theory consists of a large number of small dice arranged at the surface of this dice-shaped learning means, subdividing the learning means into a plurality of flat layers parallel to the edges of the learning means. The individual flat layers of small dice can each be rotated about the axes of the dice-shaped learning means which pass through those layers. In such a learning means, the object to be achieved is to design the surfaces of the small dice of this dice-shaped learning element in such a manner that users can use it to check the combinational state of the learning means which has been reached without peering and inspection, so that even blind people can use this dice-shaped learning means. The invention achieves this object in that the lateral surfaces of the small dice have different surface compositions, rough surfaces and/or smooth surfaces and/or heat conductive surfaces and/or heat-insulating surfaces and/or surfaces provided with notches parallel to the edges and/or surfaces provided with diagonal notches and/or vibrating surfaces and/or electrically conducting surfaces and/or electrically non-conducting surfaces. Such a dice-shaped learning element can be used at increased speed because the user, when twisting the individual flat layers relative to each other during the very short operation of rotation, feels whether the surface of the small dice is rough or smooth, heat-conducting or heat-insulating, with or without notches, with or without a vibrating surface or electrically conductive surface.
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