Vector Spaces – A Kuratowski lock operator induces the unique topology

There is a conclusion: a Kuratowski closure operator $ f: P (X) to P (X) $ has the property that there is a (unique) topology $ dau $ on $ X $ so that $ f $ is the final operator for this topology.

We can define the topology $ tau = {X setminus f (A): A subseteq X } $, How unique is the topology that fulfills the property mentioned above?

File system – Why doesn't macOS assign unique names to files?

I want to anticipate this question by disclosing that I know next to nothing about computer architecture, memory, and operating systems.

For a personal project, I'm trying to create a roadmap for creating a small utility that can be used to create links to annotations in PDFs.

However, I hit a small roadblock. Suppose I have a PDF called Doc. I read and make a note called Annot. Since the annot is contained in Doc, I would first have to link to the path of Doc:

Path > Doc > Annot

This could work by linking to the path of the document. However, there is a problem with it. I often reorganize my PDF files as my collection grows, so such a link will soon be broken. Which leads to my question:

Why doesn't macOS by default assign a UUID to every file on your hard drive for easy retrieval? This way I could link like this:

  1. Link to the document path with UUID as argument
  2. If the path does not contain a document with Doc's UUID, find a document with that UUID and go to the path
  3. Return Doc

I think I might be able to find a similar solution by assigning a UUID to a document metadate.

In summary, there is a reason why this is not included by default? Is there a reason why this would be a bad idea?

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C # – How do I define a field in the CodeFirst Entity Framework .Net Core as unique?

How can I define this in the field? e-mail Can’t repeat email addresses?

My class:

namespace BusinessWebApi.Models
{
    (Table("UserApi"))
    public class UserApi
    {
        (Key)
        (DatabaseGenerated(DatabaseGeneratedOption.Identity))
        (Column(Order = 1, TypeName = "INT"))
        public int Id { get; set; }

        (Column(Order = 2, TypeName = "VARCHAR"))
        (StringLength(50))
        public string Email { get; set; }

        (Column(Order = 3, TypeName = "VARCHAR"))
        (StringLength(200))
        public string Password { get; set; }

        (Column(Order = 4, TypeName = "DATETIME"))
        public DateTime CreateDate { get; set; }

    }
}

hive – SQL filter only if each unique value contains more than N records

Here is my sample SQL statement:

SELECT *
FROM my_table
WHERE DAY = '${date}'
GROUP BY DAY
         name,
         value
ORDER BY name ASC

For example 3 unique names in the "Name" column: Alice, Bob, Clark.

Alice has 5 rows, Bob has 9 rows, Clark has 12 rows.

I want to add a filter if rows with the same value are> 10 rows. & # 39; Clark & ​​# 39; fulfilled in this case.

How do I add that? under WHERE?

bitcoin core – use of bitcoind "walletnotify" only for unique transactions

While using bitcoind "walletnotify" my curl command gets 3 hits, which generates 3 unique transaction hashes. For unique transactions, however, it only needs to be executed once.

I heard about walletnotifynew from: – "https://www.multichain.com/qa/9566/how-can-i-use-walletnotify-command-to-get-notification"
but it doesn't work.

My bitcon.config file

rpcuser=root
rpcpassword=root
testnet=1
test.rpcport=8332
rpcallowip=127.0.0.1
server=1
rpcbind=127.0.0.1
walletnotifynew=/home/scripts/transaction.sh %s
#walletnotify=curl -d "txid=$1" http://127.0.0.1:8888/api/v1/listen-transaction %s  

Database entry I transferred the three incoming with the same wallet, but there should only be one outgoing entry

select * from transaction;
+-------+--------------+------------+-------------------------------------+-------------------------------------+---------+------------------------------------------------------------------+----------+--------+
| tx_id | amount       | made_on    | sent_from_address                   | sent_to_address                     | success | transaction_hash                                                 | tx_type  | userid |
+-------+--------------+------------+-------------------------------------+-------------------------------------+---------+------------------------------------------------------------------+----------+--------+
|    53 | 0.0000000000 | 2020-02-17 | NULL                                | 2NFgnEMcE4kvvCLXK6uiEgb3dZuVLGUK75v |       1 | 11acce71f3d10330e10d70f5ee974abe5d216ec188309b61d1f751a1615d439d | INCOMING |   NULL |
|    52 | 0.0000000000 | 2020-02-17 | NULL                                | 2NFgnEMcE4kvvCLXK6uiEgb3dZuVLGUK75v |       1 | bc3267ffcc44b8d526cbb1de19f653bc90aedda4dc4fc2fc9ab18a954e7347c1 | INCOMING |   NULL |
|    50 | 0.0001000000 | 2020-02-17 | 2N6MqukeqDftwXsVDBSBkDrnbvzaXoNwNhi | 2NFgnEMcE4kvvCLXK6uiEgb3dZuVLGUK75v |       1 | 9bb2ab339930a68f33ce3521bee46363cbd29a87c68b718c4ae415a3ba53b7b8 | OUTGOING |      1 |
|    51 | 0.0000000000 | 2020-02-17 | NULL                                | 2NFgnEMcE4kvvCLXK6uiEgb3dZuVLGUK75v |       1 | 2e0976cd310fe1d740227cec0ae615dae668d4efeea740e51b81cb1b89dd2a47 | INCOMING |   NULL |
+-------+--------------+------------+-------------------------------------+-------------------------------------+---------+------------------------------------------------------------------+----------+--------+


Javascript – Would this be a safe way to create unique IDs?

Is the following code safe to create unique IDs for objects?

I will create new yoga classes and must have a unique ID for each class. I created this little code to generate the ID numbers.

Especially with regard to the uniqueIdCreatorHandler methodWould this solution perform poorly, or is it anything but elegant?

what would you say

CodeSandBox here

The code is also represented as follows:

import React from "react";

export default class App extends React.Component {
  state = {
    id: "",
    ids: ({ id: 7 }, { id: 14 })
  };

  uniqueIdCreatorHandler = () => {
    let ids = (...this.state.ids);
    let highestId;
    if (ids.length === 0) {
      highestId = 0;
    } else {
      highestId = this.state.ids
        .map(value => {
          return value.id;
        })
        .reduce((a, b) => {
          return Math.max(a, b);
        });
    }
    let newId = highestId + 1;
    ids.push({ id: newId });
    this.setState({ ids: ids });
  };

  idDeleterHanlder = currIndex => {
    let ids = this.state.ids;
    ids.splice(currIndex, 1);
    this.setState({ ids: ids });
  };

  render() {
    let ids = this.state.ids.map((id, index) => {
      return (
        

this.idDeleterHanlder(index)} key={id.id}> id:{id.id}

); }); return (

all ids below:

{ids}
); } }

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