微分几何学

• 八(divide; separate; eight)ASSOCIATIVE
• 刀(knife; blade; sword)RADICAL

Using a knife to chop something in half represents division or separation.

• 几(small table; depicted form)ASSOCIATIVE

A slanting stroke and a horizontal-curved stroke form a small table with two sturdy legs.

• ⺍(two hands (indicating learning))ASSOCIATIVE
• 冖(roof; house)ASSOCIATIVE
• 子(child)RADICAL

A child sitting under a roof with two hands diligently studying represents learning.