The symbol ∀ means “
In logical argument and mathematical proof, the therefore sign, ∴, is generally used before a logical consequence, such as the conclusion of a syllogism. The symbol consists of three dots placed in an upright triangle and is read therefore.
∃ This symbol means there exists. For example, “∃ a horse”. This symbol means there does not exist. For example, “ a unicorn”. (yet) Symbols for dealing with elements and sets ∈, /∈ The symbol ∈ is used to denote that an element is in a set.
∋ (the such that sign) means "under the condition that'' and first appeared in the 1906 edition of Formulaire de mathematiques by the logician Giuseppe Peano (1858--1932). However, it is much more common (and less ambiguous) to just abbreviate "such that'' as "s.t.''.
In mathematical logic and computer science the symbol ⊢ ( ) has taken the name turnstile because of its resemblance to a typical turnstile if viewed from above. It is also referred to as tee and is often read as "yields", "proves", "satisfies" or "entails".
In logic, the symbol ⊨, ⊧ or is called the double turnstile. It is often read as "entails", "models", "is a semantic consequence of" or "is stronger than".
The ⊃ symbol is used to symbolize a relationship called material implication; a compound statement formed with this connective is true unless the component on the left (the antecedent) is true and the component on the right (the consequent) is false, as shown in the truth-table at the right.
≃ : ASYMPTOTICALLY EQUAL TO (U+2243) ≅ : APPROXIMATELY EQUAL TO (U+2245)
∀ means "For each (value of) ..." and ∃ means "For at least one (value of) ..."
⊙ (mathematics, physics) A vector pointing out of the page. (mathematics) An operator indicating special-defined operation that is similar to dot product.
In set theory, a subset is denoted by the symbol ⊆ and read as 'is a subset of'. Using this symbol we can express subsets as follows: A ⊆ B; which means Set A is a subset of Set B. Note: A subset can be equal to the set. That is, a subset can contain all the elements that are present in the set.
Sets are represented by the symbol { }. i.e., the elements of the set are written inside these brackets. Example: Set A = {a,b,c,d}. Here, a,b,c, and d are the elements of set A.
The mathematical symbol or notation for mean is 'x-bar'. This symbol appears on scientific calculators and in mathematical and statistical notations. The 'mean' or 'arithmetic mean' is the most commonly used form of average.
According to the BODMAS rule, if an expression contains brackets ((), {}, []) we have first to solve or simplify the bracket followed by 'order' (that means powers and roots, etc.), then division, multiplication, addition and subtraction from left to right.
It means 4 is multiplied 2 times, i.e., 4 × 4 = 16.
It means therefore and is similar to QED, which is short form for the Latin phrase that translates as 'Thus it is Demonstrated'.
The triple bar or tribar, ≡, is a symbol with multiple, context-dependent meanings indicating equivalence of two different things. Its main uses are in mathematics and logic. It has the appearance of an equals sign ⟨=⟩ sign with a third line. ≡ Identical to.
Discrete mathematics comes in mind. But calculus is already inherent in discrete mathematics. Combinatorics, set theory or graph theory are usually core elements in a discrete math course.
?? — Shy, nervous (usually in the context of flirting)
A girl might also use “uwu” to convey bashfulness.
Among uwu's many uses, some girls also use it to express shyness or a cute sort of sheepishness. This is often accompanied by the “??” emojis, which convey a pleading or demure meekness.
?? — Shy, nervous – usually in the context of flirting.
Negation, conjunction, disjunction, implication, and biconditional are the five logical symbols.
logical (inclusive) disjunction. or. propositional logic, Boolean algebra. The statement A ∨ B is true if A or B (or both) are true; if both are false, the statement is false.
Disjunction: ∨, v: or. Implication: →, –>: implies, if … , then … . Biconditional: ↔, : if and only if. Logical equivalence: ≡