Explanation of technical terms: empty set: it is agreed that there is a set without any elements, which is called an empty set, denoted as φ, and sometimes represented by {}. According to the definition of subset, an empty set is a subset of any set.
Related phrases:
Empty set axiom? Empty set axiom
Empty set axiom? Empty set axiom
Non-empty set Non-empty set; Nonempty set
Bilingual example:
Start? From where? Scratch: Where to start? Ann? Empty? Settings? Yes? Conditions? And then what? Supplement? Yours Own. ?
Start from scratch: start with an empty set of conditions and then add your own conditions.
This happened? Because? That? Fields? Is it? Empty,? So we? Is it? Really? Multiplication? Out of thin air (or? Empty? Settings? By who? Empty? Settings). ?
This problem occurs because the field is empty, so the actual calculation is zero times zero (or empty set times empty set).