What exactly does 0 mean in math? 0 is the smallest non-negative integer in the set of integers, representing 'nothing' or 'the starting point'.
A hexagon is a flat shape with six sides and six angles, and it's very common in everyday life. For example, a bee's honeycomb and snowflake crystals are typical regular hexagon structures, which are not only beautiful but also save materials.
A helix is a twisted curve that looks like a coil or a screw, and it's a shape commonly seen in biology, for example in DNA and various proteins. Helices can be left-handed or right-handed. Looking along the helix's axis from the center, if the spiral goes counterclockwise from near to far, it's left-handed; if it's the other way around, it's right-handed.
Aesthetics (Greek: αισθητική; English: Aesthetic) is a sub-discipline of philosophy founded by the German philosopher Alexander Gottlieb Baumgarten in 1750. It was initially defined as the science of sensory knowledge (Ästhetik). The Greek root 'aesthesis' means sensory perception, and its study covers aesthetic activities, philosophy of art, and the world of imagery. Baumgarten's concept of 'sensory science' emphasizes that sensory cognition grasps the completeness of relationships between things in a quasi-rational way. Meanwhile, the French scholar Charles Batteaux in 1746 first proposed a system of 'fine arts' covering poetry, painting, and other forms. Hegel limited aesthetics to the philosophy of fine art, while Kant established the independent status of aesthetic judgment in the Critique of Judgment.
Density refers to the mass of a substance per unit volume, usually represented by the symbol ρ, and the international unit is kilograms per cubic meter (kg/m³).
Financial applications usually have two layers of meaning: one is the use of fintech in areas like banking, investment, and risk management, and the other is the financial software or apps that everyday users use. Right now, financial applications are rapidly evolving from digital to intelligent, with AI agents and blockchain technologies becoming core drivers.
Science is a systematized body of knowledge that reflects objective laws, and it's also a way to explore the world.
A number system is basically the rule for counting, and the core idea is 'carry over when you reach a certain number.' In daily life, we mostly use the decimal system, while computers use the binary system at the core.
Parentheses usually refer to symbols used to indicate notes in an article, with common types including round brackets (), square brackets [], curly brackets {}, and so on.
Number base calculations mainly involve converting between different bases. The core method is to convert other bases to decimal using 'expand and add by place value,' and convert decimal to other bases using 'divide by the base and take the remainder' or 'multiply by the base and take the integer part.' Binary, octal, and hexadecimal can be quickly converted using the grouping method.