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1. Top results related to what is the meaning of lenoir state symbol definition chemistry examples

   • What is the meaning of the following method definition?

     Top Answer

     Answered Feb 10, 2017 · 2 votes

     I and O are declared as generic type parameters. They're generic types introduced by the method itself, as said here: https://docs.oracle.com/javase/tutorial/java/generics/methods.html

     Generic methods are methods that introduce their own type parameters. This is similar to declaring a generic type, but the type parameter's scope is limited to the method where it is declared. Static and non-static generic methods are allowed, as well as generic class constructors.

     If you don't declare <I, O>, java will look for types called I and O (which won't be there, since they're supposed to be generic).

     I think @khelwood put it nicely (see comments on original question): It's saying: "In the following definition, I and O are standing in for some types that depend on the situation when the method is called."

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     1/5

   • What is the meaning of `abstract` in the `interface definition`?

     Top Answer

     Answered Jan 09, 2013 · 9 votes

     So what the meaning of 'a here?

     This is like parametric polymorphism for functions (in Java it is known as generics) but for types. In this code sets which store ints will have type int set, strings --- string set etc. 'a is in front because it is common OCaml syntax. In revised syntax type variables are written after typenames: like list int or set list int. For more information about different kinds of polymorphism I can recommend you a book Types at programming languages, part V: Polymorphism. If you understand parametric polymorphism for functions I think it will not be difficult to enhance your knowledge for types.

     what details has been hidden?

     In your ML file, the type 'a set is defined as a list of elements. To search some element in a list, one must iterate through the list and call (=) for every element (this is the way the function List.mem works). AFAIR in OCaml the stdlib sets are implemented as balanced trees and values which are stored in sets should have function compare: t -> t -> int where t is the type of elements stored in the set. However sets can be defined differently and if you look only at abstract types in .mli, then you can only guess how it is implemented in .ml file.

     Indeed, in this definition, the type 'a list has been used to implement the type 'a set, but from the interface file, this information is not visible - the hidden part is the fact that the set type is really a list. The way the module has been implemented, and the choice of which information has been made available to the external world, make it possible for a program to use the set type without knowing how it's made.

     It's an important feature of software design, since it let the developer change the implementation of that module without having to change the code that uses it. Making the type abstract enforces that separation: you will get a type error if you try to use a list as a set outside the module.

     type 'a set = 'a list

     AFAIR, this line introduces a 'type synonym' (or alias) saying: here and below the type set is the same as list and you can use set with functions which expect list and vice versa.

     When you see 'a set you should understand that it is just a set of something, when you put a string to set then it will be a string set. If you see 'a set you can't say what is stored or will be stored in this set, but if you see string set, you can. Type synonyms are also mentioned in the book above.

     P.S.

     So you mean type 'a set = 'a list indicates that the set is expecting list as parameters?

     No, it doesn't. You just add new type alias in this line. It doesn't shrink a number of types which can be substituted to 'a type variable. If you write

     # type 'a set = 'a list;;type 'a set = 'a list# let create x : _ set = [x];;val create : 'a -> 'a set = <fun>-

     and then

     List.map ((+)1) (create 2);;-

     the compiler will infer the type of create 2 as an int set (since an int value is used for the parameter of type 'a of create, and the return type of that function is 'a set), then it will look at its table of type aliases (synonyms) and when it will understand that type set is the same as type list it will continue the type inference's process.

     You should understand that you should write the right number of type variables when creating a new synonym, i.e. type 'a new_t = ('a*'b) list doesn't make any sense both for me and the compiler. There should be at least as many type variables in the left as in the right: type ('a, 'b) new_t = ('a * 'b) list, for example, works.

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     2/5

   • What is the meaning of symbol $ in jQuery?

     Top Answer

     Answered Mar 26, 2015 · 144 votes

     The jQuery object :)

     From the jQuery documentation:

     By default, jQuery uses "$" as a shortcut for "jQuery"

     So, using $("#id") or jQuery("#id") is the same.

     Other Answers

     Answered May 08, 2020 · 50 votes

     Strange but true, you can use "$" as a function name in JavaScript. It is shorthand for jQuery(). Which you can use if you want. jQuery can be ran in compatibility mode if another library is using the $ already. Just use jQuery.noConflict(). $ is pretty commonly used as a selector function in JS.

     In jQuery the $ function does much more than select things though.

     • ["You can pass it a selector to get a","collection of matching elements from the DOM. "]
     • ["You can pass","it a function to run when the","document is ready (similar to","body.onload() but better). "]
     • ["You can pass it a string of HTML to turn","into a DOM element which you can","then inject into the document. "]
     • ["You can pass it a DOM element or","elements that you want to wrap with","the jQuery object."]

     Here is the documentation: https://api.jquery.com/jQuery/

     Other Answers

     Answered Apr 03, 2018 · 34 votes

     It is syntactic sugar. It is not specific only to jQuery; other libraries use it as well. You can look for a full-details article about the use of dollar sign in JavaScript here.

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     3/5

   • What is the meaning of '@' symbol in Oracle SQL?

     Top Answer

     Answered Jan 26, 2021 · 27 votes

     It refers to a non-local table, the bit behind the @ is the db descriptor.

     select * from question_answer@abcd where id = '45'-

     Means select not from the local question_answer table, but from the table on the db designated as abcd. The keyword to google for is dblink

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     4/5

   • What is the meaning of having void in the constructor definition?

     Top Answer

     Answered Mar 29, 2009 · 44 votes

     The two are same, at least in C++. In C, providing an empty pair of parentheses typically means an unspecified parameter list (as opposed to an empty parameter list). C++ does not have this problem.

     How can a correct answer get downvoted so many times? Yet another SO bug?

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     5/5

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2. guides.hostos.cuny.edu › che105 › chapter4Chapter 4 - Atoms, Molecules, and Ions - CHE 110 ...

   guides.hostos.cuny.edu › che105 › chapter4

   Apr 9, 2024 · But it can be unwieldy to use the name of elements all the time. Instead, chemistry defines a symbol for each element. The atomic symbol is a one- or two-letter abbreviation of the name of the element. By convention, the first letter of an element’s symbol is always capitalized, while the second letter (if present) is lowercase.

   • Author: Linda Miles

   • Publish Year: 2019

3. www.geeksforgeeks.org › chemical-formulaChemical Formula of Common Compounds, Table, Types, and ...

   www.geeksforgeeks.org › chemical-formula

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   Apr 2, 2024 · Chemical formula is a way to describe chemical ratios of atoms that make up a specific chemical compound or molecule in chemistry. Chemical element symbols, numbers, and sometimes other symbols, such as parentheses, dashes, brackets, commas, plus (+), and minus (-) signs, are used to represent the chemical elements, atoms, or ions.

4. www.geeksforgeeks.org › chemical-equationsChemical Equations – Definition, Representation, Types

   www.geeksforgeeks.org › chemical-equations

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   Apr 2, 2024 · Short-Hand Method of Representing a Chemical Reaction. A chemical equation is a means of describing a chemical reaction using symbols and equations for the substances involved in the process. The example below demonstrates how to clearly understand the meaning of a chemical equation.

5. www.geeksforgeeks.org › normalityNormality - Definition, Formula, Equations and Solved Examples

   www.geeksforgeeks.org › normality

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   Apr 3, 2024 · Example 1: Calculate the normality of a 310 mL NaOH solution made by dissolving 0.4 gram of NaOH. Solution: The formula to calculate the normality is, Normality (N) = Number of gram equivalents / Volume of the solution in liters. Number of gram equivalents = weight of solute / Equivalent weight of solute. Equivalent weight of solute = 23+16+1 = 40.

6. en.wikipedia.org › wiki › Glossary_of_mathematicalGlossary of mathematical symbols - Wikipedia

   en.wikipedia.org › wiki › Glossary_of_mathematical

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   5 days ago · Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...

7. en.wikipedia.org › wiki › MetalloidMetalloid - Wikipedia

   en.wikipedia.org › wiki › Metalloid

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   5 days ago · A metalloid is a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. There is no standard definition of a metalloid and no complete agreement on which elements are metalloids. Despite the lack of specificity, the term remains in use in the literature of chemistry .

8. en.wikipedia.org › wiki › CarbonCarbon - Wikipedia

   en.wikipedia.org › wiki › Carbon

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   5 days ago · Carbon (from Latin carbo 'coal') is a chemical element; it has symbol C and atomic number 6. It is nonmetallic and tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 electrons. It belongs to group 14 of the periodic table. Carbon makes up about 0.025 percent of Earth's crust.