Logic - how to write $\exists !x$ without the $\exists !$ symbol
17224
Write ‘There is exactly 1 person…’ without the uniqueness quantifier
78009
Why can't we use implication for the existential quantifier?
141197
In JavaScript, is there an easier way to check if a property of a property exists?
138395
Logic: Using Quantifiers To Express "At Least 2?"
112077
How to check if a value already exists to avoid duplicates?
76808
Meaning of ! in Java syntax
24759
How do I use the conditional (ternary) operator?
146188
Why does a proof of $\exists f: X\to Y$ injection $\iff \exists g: Y \to X$ surjection requires the axiom of choice?
46395
Is it 100% correct to replace !!someVar with Boolean(someVar)?
40229
How do I check if a variable exists?
37369
How do I check if two logical expressions are equivalent?
103112
Does the existential quantifier distribute over an implication?
37438
How do I use the CoffeeScript existential operator to check some object properties for undefined?
108837
How to show that $\vdash (\forall x \beta \to \alpha) \leftrightarrow \exists x (\beta \to \alpha)$?
88281
Mixing and Distributing Qualifiers ($\forall x$, $\exists x$)
107154
History of notation: "!"
27233
Nested If Exist statements in Batch File