gr.group theory – Conjugacy classes in reductive group under adjoint action of parabolic subgroup

Given a reductive group $G$ over a finite field and a parabolic subgroup $P$ , I wonder what are the orbits in $G$ under the adjoint action of $P$. This should be standard, but I can only find results on the orbits inside $P$.

Actually, I would like to know which (say) permutation representations of the parabolic $Pto operatorname{Sym}(Omega)$ admit an extension to a $P$-equivariant map of sets $Gto operatorname{Sym}(Omega)$. But I do not know in which context this question falls.

I would already be very happy for an answer in the case $G=operatorname{GL}_3(mathbb{F}_p)$ and the $(2,1)$– parabolic $P=(operatorname{GL}_2(mathbb{F}_p)times operatorname{GL}_2(mathbb{F}_p))ltimes mathbb{F}_p^2$. I want to play around with a group-theoretic version of connection and parallel transport on the Grassmanian $operatorname{Gr}(3,2)$ over $mathbb{F}_p$.

Thanks and greetings,
Simon

dnd 5e – Does the bonus action from spiritual weapon break invisibility?

Invisibility states:

The spell ends for a target that attacks or casts a spell.

and Spiritual Weapon states:

you can make a melee spell attack against a creature within 5 feet of the weapon.
(…)
As a bonus action on your turn, you can move the weapon up to 20 feet and repeat the attack against a creature within 5 feet of it.

Since using Spiritual Weapon involves making an attack it breaks Invisibility.

Furthermore you can look to the rule in the section “Making an Attack” (PHB, page 194):

If there’s ever any question whether something you’re doing counts as an attack, the rule is simple: if you’re making an attack roll, you’re making an attack.

Showing the status of an action on a button

Keep in mind the function of user interface objects.

Displays and status icons are read-only objects to inform the operator.

Buttons enable the operator to take action of some kind.

Combining these two functions was popularized by the play/pause button on computer audio and video players. From one perspective it makes sense to have 2 mutually exclusive actions share a single control. But the reason these systems work so well is that the audio or video provide abundant feedback to the user of the current state. Displaying only action info on a button without user feedback leaves the operator with the puzzle of deducing the current state which introduces ambiguity. If a button is labeled “Lock Door” does that mean the door is currently open or currently unlocked? Nobody knows.

I would argue that the green light is too ambiguous to effectively inform the user of the status. Does the green light mean that it is syncing or that it is ready to sync? Remember your job is to eliminate ambiguity. You should add a label above the button to inform the operator of the state. After all, it’s no more work to add a label above the button than it is to put a status light on the button. The label should display “syncing” or better yet “now syncing” along with “waiting” and another word (or just blank) for any other state needed.

dnd 5e – Can you move during your reaction in a ready action?

So let’s say that the party or the baddies want to dive a target all at once, but they are far apart on the turn order. Can the divers all do a ready action and then all jump in at once?

Example:

Turn order is:

  1. PC1
  2. PC2
  3. NPC1
  4. PC3
  5. PC4
  6. NPC2

Can NPC1 do a ready action of “when NPC2 moves in to attack a PC, I move in to attack the same PC” and then move and attack as the reaction?

development – SystemUpdate() inside my remote event receive will raise “Access denied. You do not have permission to perform this action or access this resource.”

I have the following code inside my remote event receiver (which run on item added):-

 using (ClientContext context = TokenHelper.CreateRemoteEventReceiverClientContext(properties))
            {
              currentItem("OrderAssignToApprover2") = new FieldUserValue() { LookupId = spUser.Id };
              currentItem.SystemUpdate();

now if a non-admin user add an item then the remote event receiver will raise this error on the SystemUpdate():-

Access denied. You do not have permission to perform this action or access this resource.

but if admin user add an item then the remote event receiver will works fine OR if i change the remote event reicever to run using App Permsion, as follow:-

using (ClientContext context = Helpers.GetAppOnlyContext(properties.ItemEventProperties.WebUrl))
            {
              currentItem("OrderAssignToApprover2") = new FieldUserValue() { LookupId = spUser.Id };
              currentItem.SystemUpdate();

so can i assume that the SystemUpdate (unlike Update) require the user to have full control on the site?If this is the case then is there a way to allow non-admin users to execute SystemUpdate?
Thanks

youtube – Data transfer from web to machine when performing specific action

I’m sure that most of us know, that when you’re browsing YouTube you can hover over a video to see some scenes from that video. In Youtubes specific case we see a short part of the video when hovering over it.

My questions is: When exactly does the data for these short clips/pictures get transferred to your browser. Does it happen when I hover over the video clip? Or do I already get the data for the entire first page when I open the website? Or is there no general rule and each website/browser handles this differently.

PS: The original question was broader in nature, i.e. not focusing specifically on Youtube. If there is a general answer to the question, i.e. applies to the majority of modern websites, I’m interested in that as well.


I’ve been pointed to this SE (see this question). If this is not the appropriate place to ask this question, please let me know.

dnd 5e – Can you make a bonus-action attack from Two-Weapon Fighting before you take your action?

You can’t take the bonus-action attack before the Attack action (in which you attack with a one-handed light weapon), because the bonus-action attack is conditional upon you taking that action.

Jeremy Crawford addresses this on Twitter here (prompted by the wording of the Shield Master feat):

Clarification about bonus actions: if a feature says you can do X as a bonus action if you do Y, you must do Y before you can do X. For Shield Master, that means the bonus action must come after the Attack action. You decide when it happens afterward that turn.

This contradicts a previous ruling by him via Twitter, in which he stated that, “As with most bonus actions, you choose the timing, so the Shield Master shove can come before or after the Attack action.” Crawford acknowledges this change here:

In 2017, I changed the ruling on bonus action timing because the old ruling was illogical. The original ruling failed to account for the fact that X relying on Y is a form of timing. The new ruling corrects that oversight.

And further explains his reasoning here:

The old ruling on bonus action timing didn’t quiet questions on that timing. Instead, the illogical ruling fueled questions, and it even inadvertently led some fans to think our choice of words like “if” or “when” had super-precise meanings in bonus actions. They don’t.


As you quote, the Two-Weapon Fighting rule says:

When you take the Attack action and attack with a light melee weapon that you’re holding in one hand, you can use a bonus action to attack with a different light melee weapon that you’re holding in the other hand. You don’t add your ability modifier to the damage of the bonus attack, unless that modifier is negative.

The bonus-action attack is conditional upon you using the Attack action and attacking with a qualifying weapon. As such, you can’t use your bonus-action attack before you’ve taken the action that qualifies you for it.

How do form #states interact with dialog action buttons, if at all?

A dialog can be fired by a link formatted as such:

<a class="use-ajax" 
    data-dialog-options="{&quot;width&quot;:400}" 
    data-dialog-type="modal" 
    href="https://drupal.stackexchange.com/some/path">
    Some path displayed in modal dialog.
</a>

If the contents of /some/path are a form, then drupal takes its action buttons and drops them into a “footer” <div class="ui-dialog-buttonset"></div> in the dialog. This seems to take into account the initial state of the buttons — so if submit has the disabled attribute by default then the corresponding UI button gets the .is-disabled class applied. The “real” form action buttons are rendered but set to display: none.

However, I’ve got #states set up on my submit button with

$form('actions')('submit')('#states') = (
  'disabled' => (
    ':input(name="field_fivestar_rating(0)(rating)")' => (
      (
        ('value' => '-'),
        ('OR'),
        ('value' => '0'),
      ),
    ),
  ),
);

The “real” form submit button is updated correctly according to its #states attribute, but the same cannot be said for the corresponding dialog button. It seems to be static based on the initial state of the submit button.

Is this expected behavior? If so, is this something that deserves an issue in the queue? Seems like an oversight and usability concern.

pathfinder 1e – Is there a way to charge as a move action (or lower)?

Since you say in your other post that 3.5e is allowed, I’m going to make a suggestion from there.

Spiritual Totem barbarian (Complete Champion p.46), with the Lion totem, gains the Pounce ability at level 1.

Pounce (Ex): When a creature with this special attack makes a charge, it can follow with a full attack – including rake attacks if the creature also has the rake ability.

This isn’t exactly “charging as a move action”, but does allow a Full Attack after a charge.

pathfinder 1e – Charging as a move action?

Since you say in your other post that 3.5e is allowed, I’m going to make a suggestion from there.

Spiritual Totem barbarian (Complete Champion p.46), with the Lion totem, gains the Pounce ability at level 1.

Pounce (Ex): When a creature with this special attack makes a charge, it can follow with a full attack – including rake attacks if the creature also has the rake ability.

This isn’t exactly “charging as a move action”, but does allow a Full Attack after a charge.