2. Flexibility: the flexible change of thinking in the divergent direction. For example, when doing a proof problem, when it is difficult to follow, the reduction to absurdity will be used to explain that it is wrong, thus completing the proof.
3. Originality: the degree to which thinking creates uniqueness and novelty, such as applying for a patent and completing an invention and creation, must have its own unique place.
4. Inspiration: that is, thinking marks the arrival of a breakthrough with the sudden arrival of time, showing an illogical quality. For example, after Newton was hit by an apple, he was inspired and began to think about why the apple fell to the ground instead of the sky, and finally discovered the law of gravity.
5. Variability: Both new ideas and differences must be realized through constant changes, and old things need to be replaced with new ones. You can't be bound by old ideas all the time.
6. Linkage: the thinking structure is flexible and changeable, and the thinking changes in time. For example, when we encounter solid geometry problems in high school, teachers often ask us to solve them in two ways, "geometric method" and "algebraic method". In practice, I often use geometric method first, and then algebraic method, which will distract my thinking of solving problems. When one method doesn't work, I switch to another.