discrete mathematics – $ S = $ {$ ∨, ∧, →, ↔ $} is complete? Can the negation be represented with the help of connectived from $ S $?

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No incoming connection on my complete bitcoin node with TOR

Can any one connect to my node running? u3ob433qu3ebkmsu.onion:8333

I am behind a CG-NAT, so I thought that using TOR would solve my problem.

My node worked for hours but no incoming connections.

grep debug.log -e inbound do not return anything.

$ bitcoin-cli getnetworkinfo

  "version": 180000,
  "subversion": "/Satoshi:0.18.0/",
  "protocolversion": 70015,
  "localservices": "000000000000040c",
  "localrelay": true,
  "timeoffset": 0,
  "networkactive": true,
  "connections": 10,
  "networks": [
      "name": "ipv4",
      "limited": true,
      "reachable": false,
      "proxy": "",
      "proxy_randomize_credentials": true
      "name": "ipv6",
      "limited": true,
      "reachable": false,
      "proxy": "",
      "proxy_randomize_credentials": true
      "name": "onion",
      "limited": false,
      "reachable": true,
      "proxy": "",
      "proxy_randomize_credentials": true
  "relayfee": 0.00001000,
  "incrementalfee": 0.00001000,
  "localaddresses": [
      "address": "u3ob433qu3ebkmsu.onion",
      "port": 8333,
      "score": 4
  "warnings": ""





# Raspberry Pi optimizations

Acces Casa knot complete with Python

A complete Casa node is running and I want to access my node in Python. How can I retrieve information from the blockchain?

attack – How could an attacker with more than 50% of complete nodes affect the Bitcoin network the most?

According to Luke Dashjr's statistics, there are currently about 61,000 bitcoin nodes supporting the bitcoin network.

And if an attacker sets up about 100,000 new complete bitcoin nodes worldwide (at $ 100 each, this could be achievable with only $ 10 million invested in total), and at some point in the future, changes are made on all the knots in his possession, which modifies certain rules? Its modification could influence the validity of certain blocks and its transactions – this would probably lead to being blocked soon – but it could also simply filter the transactions of certain addresses, or not propagate blocks of some minors / do not transmit them to D & C. Other nodes. The rest of the honest nodes (in this case 37%) would continue to relay transactions and blocks in their entirety. How could such an attacker hurt the Bitcoin network the most? Note that the attacker is not a minor and that he does not control any hash power, he controls only the majority of the existing complete nodes of the network.

flash – Is the HSS in an open or closed loop? Does it work in complete darkness?

Answer the question (s) directly,

Is the HSS in an open or closed loop?

This is in open loop. Flash triggering and synchronization do not occur by measuring the flash light incident on the sensor.

HSS is specific to the camera manufacturer and requires the flash to understand the proprietary camera signaling and syncing commands.

Does it work in complete darkness?


However, even though it was a closed loop via the imaging sensor as a feedback element, this would not be the case. a priori, prevents any HSS system from functioning. By analogy, closed-loop stepper motor control works with very variable loads when the motor starts. If the feedback controller has a fairly fast rotation control, a nominally safe start speed / torque can be used until the feedback loop can establish the difference (commanded – measured). Similarly, a camera could measure and establish the delay and flash intensity variation during the early stages of the shutter transition, if the camera was designed to do so. But it's questionable, since the operation is in open loop.

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Short version of $ NP $ -complete problem

Short version of several $ NP $-the complete sets (using karp reductions) are $ NEXP $-complete, I wonder if a succinct version of each $ NP $-the complete sets are in $ NEXP $-Achevée. I want to know that it is correct or that there is a counterexample.