## Clear a Look Up column

I have a lookup field, that has some value initially. This lookup field; lookup1; allows multiple values. Using workflow 2010 and 2013, how can I delete the values in this lookup1. Just simply set it to null, just as if nothing was selected.

Things I have done are the following:

Created a new lookup column; lookup2; exactly like lookup1, but it is always set to have no value, it is hidden. then I would update or set the field lookup1 to lookup2. The workflow gets suspended due to an error.

Set or update the lookup1 to 0. The workflow gets suspended due to an error. Thank you

Assuming you have a salted SHA-512 password hash with 5000 rounds. For example:

``{CRYPT}\$  6\$  rounds=5000\$  6835c5dcf0bb7310\$  hVod/jy7uONMSa.FVpLHb/2OrWpAj3lB/.RWdvgd3YaQAnzN3rorGhaziswwGsHfOWZYkLwXhHKnCy5By2CKr0 ``
• Could one add more rounds (e.g. another 5000 rounds) to this hashed password without knowing the cleartext password such that the hash value still would be valid if a user’s cleartext password is verified?

• If this is possible as I think it should be, are there existing tools or code to “add more rounds” to this hash value?

Btw. the cleartext password for the above hash is “password” but assume would not know this.

## Clear boot messages and open terminal on TTY1

I updated from Ubuntu Server 16.04 to 18.04 and after all other configuration fixing was done there is still one thing bugging me:

On my previous version, after booting, the `[ OK ]` messages would disappear and a terminal would start on what I think was tty1. I could simply login and continue or leave it and the screen would turn off automatically.

This doesn’t happen anymore. tty1 remains showing the boot messages and I can only access terminals on tty2 through tty6. Does anyone know how to open a terminal on tty1 after booting is complete, or switch to tty2 automatically?

My servers’ display won’t turn off if it remains on the boot status messages.

## How to clear or delete variable value permanently from computer memory?

I have created a variable in c# Now I want to clear all those variable from computer memory. Is there any way to do that?

## Unable to clear user data in Google Play Music

Google Play music occupies more than 1GB on my mobile phone. As you can see in the screenshot below, User Data accounts for most storage around ~1GB.

When I press the Clear Data button, the screen shows that storage is freed, but the data is there as soon I go back.

I have tried:

1. Clearing Data
2. Clearing Cache
3. Disabling app

My mobile is 10.or D2 and runs Android 8.1.0

## Can someone help clear up some confusion regarding the proof of Mordell-Weil Theorem?

I’m reading the proof(s) of Mordell-Weil theorem using various texts. This post is to make sure what I’m reading and understanding is correct..

Rational points on Elliptic Curves by Silverman Tate gives a proof of Mordell ‘s theorem when elliptic curves are over rationals, $$\mathbb{Q}$$and have at least one rational $$2$$-torsion point.

Then I noticed that Lawrence Washington’s book on Elliptic curves also discuss this result this, first when all roots of cubic $$f(x)$$ are in $$\mathbb{Q}$$ and then just one of them is in $$\mathbb{Q}$$. And the same goes for Cassels’ and Knapp’s book as well.

Then Lawrence Washington gives a remark that same can be said (i.e., Mordell-Weil holds) when we consider elliptic curves ($$y^2 = f(x)$$) over any number field $$K$$ and $$f(x)$$ has all roots in $$K$$ as we can prove Weak Mordell Weil in this case with some modification of the usual $$\mathbb{Q}$$ argument. But then it says nothing about the case when we just assume that $$f(x)$$ has at least one zero in $$K$$.

Now my questions,

(1) I’m assuming that we can give a proof of Mordell-Weil when elliptic curves are over K and $$f(x)$$ has (just) at least one point in $$K$$. And I think Silverman Tate’s proof in case of $$\mathbb{Q}$$ can be generalized, mainly Weak Mordell-Weil’s (Lemma $$3.4$$ in the book)

(2) What happens when elliptic curves ($$y^2=f(x)) E(\mathbb{Q})$$ and $$E(K)$$ have no $$2$$-torsion point or $$f(x)$$ has no root in $$\mathbb{Q}$$(respectively $$K$$) ? Is it the situation that is discussed in the J.S.Milne’s Elliptic Curves book or J. Silverman’s The Arithmetic of Elliptic Curves?

I would appreciate if someone could help answer some or all of the questions above or maybe just refer to an appropriate source to find these proofs/ discussions.

Thank you!

## transfer in Miami, final destination Charlotte, where do I clear customs? [duplicate]

• When do I clear US customs and immigration if connecting at a US airport to my final destination elsewhere in the US? 1 answer

I’m gonna fly from Barcelona to Charlotte with a stop in Miami. I wanted to know if I’ll need to get through the US Customs and Border Protection in Miami, because I have a flight to take from Miami to Charlotte, and the waiting between my flights it’s 1:36 hours. Or if I’ll pass through it once I get to Charlotte, where I need to take my luggage and take a domestic flight.

It’s the second time I’m flying to the States (first in 2008), and I have an ESTA.

## How to clear or remove a class in angular 6 through [ngClass]

I have 2 tabs,onclick a tab1 a div will be shown, again on click toggle button the div will expand(100% width) and collapse(25% width) by changing the class. Again when I click on tab2, and then click on tab1 my div should be remain collapse always,I mean its class should be ‘old’.Here is the code below.

## app.component.html

``<span style="cursor:pointer" (click) = "tab1()">Tab1</span>&nbsp;<span (click) = "tab2()" style="cursor:pointer">Tab2</span> <div  [ngClass]="{'old': toggle, 'new': !toggle}" *ngIf="show" class="old">   Hello </div> <button (click)="change()">change</button> ``

## app.component.ts

``import { Component } from '@angular/core';  @Component({   selector: 'app-root',   templateUrl: './app.component.html',   styleUrls: ['./app.component.css'] }) export class AppComponent {   toggle:boolean = true;   show:any; tab1(){     alert('tab1');     this.show = true; } tab2(){     alert('tab2');     this.show = true; }   change(){     this.toggle = !this.toggle;   }    ngOnInit() { this.show = false;   } } ``

## app.component.css

``.old{     width:25%;     border:1px solid;     height:200px;     cursor:pointer;     background:yellow; } .new{     width:100%;     border:1px solid;     height:200px;     cursor:pointer;     background:green; } ``