In English, when we wish to write a non-strict mathematical inequality, we will write something like this:
x ≤ 3 or y ≥ 5
In Japanese writing, however, I have also seen the symbol ≦ used to mean "less than or equal to". Which of ≤ and ≦ is more common in Japanese usage? I would be interested to know about any differences that exist across various media/genres of writing, e.g. news reports vs. scholarly papers vs. textbooks.