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- Is $ [0,1]$ a countable disjoint union of closed sets?
Can you express $[0,1]$ as a countable disjoint union of closed sets, other than the trivial way of doing this?
- Mathematics Stack Exchange
Q A for people studying math at any level and professionals in related fields
- Visually deceptive proofs which are mathematically wrong
Related: Visually stunning math concepts which are easy to explain Beside the wonderful examples above, there should also be counterexamples, where visually intuitive demonstrations are actually w
- Is the signal u[n] +u[-n] periodic? - Mathematics Stack Exchange
It is not periodic in general Let $u$ be 1 at zero and zero everywhere else, for example
- What is a simple example of an unprovable statement?
Most of the systems mathematicians are interested in are consistent, which means, by Gödel's incompleteness theorems, that there must be unprovable statements I've seen a simple natural language
- Como calcular el area de la superficie de un huevo con calculo
Estoy haciendo mi reciente evaluación interna del IB Matemáticas HL y mi tema es cómo calcular el área de superficie de un huevo Quiero aplicar el cálculo conocimiento en esta pregunta, pero mi conocimiento sobre esta área es limitada
- logic - Finding Satisfiability, Unsatisfiability and Valid well formed . . .
I have a confusion regarding how to check whether a wff is satisfiable, unsatisfiable and valid As far as I understood, valid means the truth table must be a tautology, otherwise it is not a val
- Is there a difference between unity and 1 in applied mathematics?
In my limited experience (engineering and abstract algebra courses a couple of decades back) unity is not a synonym for 1, but a generalization of 1 It's the element of some set that leaves elements unchanged when a certain operation is applied - an identity element, and specifically the identity element for multiplication rather than addition, in contexts where both of those operations are
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