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The Planklin Planner is globally popular. Isn't this the desire of people who want to live well with plans? Practice is more important than grand planning. But we often fail. Because there are so many unforeseen things that hinder our plans. So, Focus on planning within a predictable period to achieve a sense of accomplishment. Let's make a long-term plan gradually. First, let's focus on the pla..

In the last article, we talked about differentiation and the possibility of differentiation in our lives (see the last article). If life is simple, continuous, and there is no sudden situation, there will be no difficulty in predicting the future. Mathematically, such a function is called a'smooth function'. It's a name that gives you a rough idea of which function you need, even without explana..

Why can't we know the future exactly? There are too many variables in our lives. How many variables can most people predict? About two? It will vary from person to person. It is difficult for the average person to predict more than the speed and direction of the car at the same time (see previous article). On the other hand, there are so many variables in our lives. So it is not easy to predict ..

What is differential. Math? Science? Is it a difficult story? Differentiation is generally considered to be a'difficult story'. It is often referred to as a typical concept far from everyday life. Even the math teacher said this. 'Is it useful to learn differentiation?' 'Would you like to solve the differential equation when calculating change in the supermarket?' It is the'differentiated useles..

Linear is... If there are 20 changes when you first try 10, It is a state where you can get 200 values with 100 efforts. So the linearity is predictable. 10 —> 20 100 —> 200 Nonlinear is... It is 20 when 10 efforts are made, It is a situation where even if you try as much as 100, 50 changes may occur, or 400 changes may occur. So non-linearity is difficult to predict. In the graph below, The lef..

The stress accumulated in the metal can be relieved through heat treatment. In a word, stress is relieved by heating. However, it is a recovery to the previous state. The stress is relieved, but the structure is already deformed. But what if you do more heating in this state? New things happen. Re-crystallization! A crystal structure, which can be said to be the basic unit constituting the metal..

In mechanical engineering, resistance to external forces is stress. The stress that is 'stacked' inside the material is called the residual stress. We often say "Oh! It's stressful." It's a very engineering expression to say. Eventually, the accumulated stress will exceed the level that can be sustained, and the material will break off. There is no way to avoid the accumulation of stress. It is ..

Deformation occurs when any material is applied to a load, and breakage occurs when the deformation is too large. Sometimes the fracture occurs at a much lower strength, even though the breaking strength that the material can endure is determined. It happens at very unpredictable timing. Such a load is called fatigue load. Such fracture is caused by fatigue. So fatigue is dangerous. This is beca..