In mathematics, there are angles. Angles are divided into radians and general angles. Angles are the basis of trigonometric functions, the foundation of rotational geometry. In solid geometry, finding the degrees of an angle is often encountered.

In our daily lives, we always have a degree in everything. Although the degree is ethereal and unpredictable. But it is vital and indispensable. However, it is also unclear about the degree. Because different people think that the degree is different, everyone has their own understanding of what it means to be excessive.

What is related to degree is crossing, and there are transitions and transitions. One refers to the quantity, the other refers to the continuation of the stages. And then there is spending and passing. One is temporal and one is river.

used to be a non-toxic husband, but later he became a non-toxic husband. This is the process of depreciating the meaning of words, and it is also the effect of homophony.

Nothing is more familiar to us than length, width, and height, which are fundamental concepts of dimensional space. I'm just in length, why is it universal? It turns out that there is symmetry. The above three dimensions are actually symmetrical, so there should be three one-dimensional spaces! In fact, physicists believe that there is only one one-dimensional space. So, is this really the case? I don't think so. To be sure, there is definitely more than one one-dimensional space, because this can be reduced to the relationship between straight lines and three-dimensional. The straight line can be parallel to the three-dimensional edge, or it can have a certain angle with the edge. Isn't there a lot of one-dimensional space?

Ambiguity is a mathematical term, whereas whole week ambiguity is a geographical term. If you say that the two are not connected, I'm afraid it's not convincing.

Curl refers to the angular velocity of rotation. It's not the angle of rotation, but it's related to rotation. The curl of the electrostatic field is zero, which means that the angular velocity of rotation is zero. If there is no angular velocity, then rotation does not take place. Therefore, there is no rotation in the electrostatic field. Originally, there was the word static, which meant stillness. If you spin, it doesn't seem to make sense. We know that the curl of a magnetic field is not zero, so why does the magnetic field rotate? Could it be that there are two kinds of magnetic monopoles in a magnetic field? It is precisely because of the attraction and repulsion between them and between the same species that the magnetic field rotates, perhaps! We know that the divergence of a magnetic field is zero, and the divergence can be understood as the rate of change. This shows that the magnetic field does not change even though the strength of the magnetic field is not equal everywhere. So, the rate of change of the magnetic field is zero. The magnetic field is rotating, but its divergence is zero, doesn't it seem special when you think about it? Since it rotates, why does the magnetic field change rate be zero? From this, I think of rotational symmetry in space. That is, the properties of an object rotating clockwise are the same as those obtained by its counterclockwise rotation. Perhaps it is the rotational symmetry of space that makes the divergence of the magnetic field zero. However, the divergence of the electrostatic field is not zero. What does this mean? Although the electrostatic field is not rotating, the electric charge inside is moving. So, the rest of the electrostatic field is only from the overall point of view, if we look at it from the microscopic point of view, it is in motion. It is said that curl also has divergence. This means that the curl of a field is likely not to be fixed, but to be in flux. Since the magnetic field has no divergence, it stands to reason that its curl has no divergence. I didn't find a counterexample, so that should be the case.

The sun is out again today, but by this time it has already entered autumn. Mizukawa wrote this next to the table.