## Introduction

I am a blind undergraduate student in math. I use screen reading software, which uses synthesized voice to read the screen content aloud, read and write math.

Due to limitations in presentation-centric formats such as PDF and MathJax, screen readers cannot properly handle most of the mathematical content contained in them.

This means that, for the most part, I can only correctly access mathematical documents in their source format, such as LaTeX; This severely limits the resources they have access to study.
Fortunately, there are some excellent online mathematical resources that include content sources, such as Wikipedia and NLab, but sometimes they are not enough by themselves to learn a topic well.

Sometimes I have been fortunate to communicate with kind professors and editors about private textbooks, which they were able to provide in source format;
but in general it is very difficult to find other good learning resources available as a source.

Another good resource is Arxiv, which often allows you to download the source of an article, but it is very difficult to search between specific educational resources through the mountain of articles.

## Application

What would be really good is a complete list by topic of mathematical educational resources that people have made available online as a source;
and this is what I would like this question to become.

So: if you have (or know) class notes, textbooks or the like, which are available online as a source, through Arxiv or elsewhere, post it as an answer, and I will keep the question updated with a categorized list
(Note: no special processing is necessary for the LaTeX screen reader to be friendly).

Thanks in advance for making life easier for blind math students.

PS I hope this is an appropriate place to make this post; I'm sorry in advance if it isn't.

## light: as a blind person, how can I better understand how wide or narrow a field of vision is?

When a field of view is described as 120 °, that refers to the total angle. Then, 60 ° to the left of the center and 60 ° to the right.

Most camera lenses show a very restricted subset of the field of vision perceived by the human eye and vision system.

It is probably the case that the system is measured through the diagonal from corner to corner of a rectangle, because that is the longest and therefore most impressive number. But for is purpose, it really doesn't matter if it's the diagonal or horizontal field of view, both are close enough.

To get a tactile idea of ​​what this means: place both arms directly in front of you. Now, expand them so that each one has approximately two thirds of the way out of his body, basically, they are the legs of a triangle with an angle of 120 °. This camera will record approximately anything in that cone.

I don't know what your visual experience is and I'm not going to guess, so forgive me if the following is obvious to you. If not, I hope it is useful.

Human vision is not achieved primarily in the eyes: there is a great deal of processing in the subconscious brain. This means that most people are barely aware of the concept of a field of vision. The vision is only acute in the same center, but the eye moves and the brain develops a mental model.

If I consciously just look forward, I have a vague awareness of things by my side. I have read that this extends to 170 °, but due to this mental model, I am quite convinced that I can perceive things directly from the side and even a little behind. This is my brain that lies to me, but it is a generous lie because in most cases I move my head and eyes enough to continually refresh that area in my subconscious model.

Meanwhile, looking forward, I have the general perception of a 90 ° cone that I am "looking at." Maybe a little less than that … somewhere between 60 ° and 90 °. Although the sharp part of my eye only covers approximately two degrees, I have the perception that this whole area is sharp and catches my attention.

In photography, we call a lens that has a horizontal field of view of approximately 45 ° a "normal lens." This is because if I take a picture with such a lens and print it in a standard size of about 10 "(25 cm) and then keep that impression with my arm extended, the perspective shown in the image will fit more or less naturally in my direct view of the world.

If I took a picture with a lens that offered a 120 ° view and printed the same size, it would seem to be distorted, because I would normally be carrying things on the periphery to what, in the print, is my straight line. vision ahead. So, although the camera system you are looking at has a narrower field of view than the peripheral vision of the human vision system, it is definitely in the range that we would consider "wide angle" in photography, in fact, "ultra wide angle."

## dnd 5e: does the radiant artificial infusion weapon blind a remote or hidden attacker?

Unless the function offers a specific exception, or there is a general rule, things do what they say they do. In the description of Radiant Weapon, no exception is given to creatures that are hidden or remote attackers, either specifically or in general, that would prevent this effect from blinding them, so it would also apply to them.

As a counterexample, consider the spell Blindness / Deafness:

You can blind or deafen an enemy. Choose a creature that you can see within reach make a saving shot of the Constitution. If it fails, the target is blinded or deaf (of choice) for the duration. At the end of each of its turns, the target can make a saving shot of the Constitution. In case of success, the spell ends.

In the case of this spell, it specifically says that they must be seen and within range. The Radiant Weapon effect has no such requirements.

## dnd 5e: Does a creature with blind vision have a disadvantage when attacking an invisible target?

Compare Blindsight and Truesight with the Faerie Fire rules. Creatures trapped in Faerie Fire are described in the spell. But Faerie Fire not only allows you to feel them, but also specifies that the creature does not benefit from invisibility.

Now compare the text for blurring, which disadvantages attacks based on visual stimuli. An attacker is immune if he does not depend on sight, like blind sight, or can see through illusions, like truth. Explain that your benefits are canceled.

From a rules-based point of view, there is a certain benefit that invisibility has that blur does not have, and there is a benefit to Faerie Fire that Blindsight and Truesight lack.

From the narrative point of view, Blindsight allows you to feel an invisible creature, but not perfectly. You may be able to feel that the creature is by your side, and perhaps you may discover that they are attacking. But no matter how good your ears or nose are, you will not be able to track finer details such as eye movement or shoulder position, so you cannot be sure of knowing how the details of how the creature is attacking or defending.

And Truesight may have similar narrative limitations. Truesight is a way of seeing through illusions and invisibility, but it does not grant infallible vision enough to nullify these effects. While it is not explained WHY it does not completely nullify invisibility, there are a variety of explanations. The spell / element that granted it could be defective. There may be too much information for the brain to process to see invisibility perfectly. Because of that, there is a visual delay or motion blur or slow reactions.

But in the end, it all comes down to DM. Personally, I would say that the person of the blind / true vision could use his reaction to try to perceive an impending attack, or an additional action to try to identify how the person defends himself. The person of sight would use a perception control against a stealth control of an invisible person. If perception wins, I would say that the invisible person was making enough noise or moving enough dirt or telegraphing his movements too much and gave away his defensive posture or attack pattern, nullifying the additional benefit of invisibility.

## Interestingly, it seems to be the case that a vampire I can not spells a blind target or any creature that can't see the vampire

You have correctly cited the Vampire Charm ability by saying:

The vampire points to a humanoid that can see less than 30 feet from him. If the target can see the vampire, the target must succeed in a saving throw DC 17 Wisdom against this magic or be enchanted by the vampire (…)

Compare this with the Lovely person spell that has no such requirement:

You try to enchant a humanoid that you can see within reach. You must make a Wisdom salvation throw, and do so with advantage if you or your partners are fighting (…)

And now compare it to the Eyes of Charming that have this same restriction:

These glass lenses fit over the eyes. They have 3 charges. While using them, you can spend 1 charge as an action to cast the enchanted person spell (except DC 13) on a humanoid less than 30 feet from you, as long as you and the target can see each other (…)

This shows that there are at least lovely effects that also require a bi-directional line of sight.

It should be noted that being under the condition of blinded make in fact, the creature cannot see:

A blinded creature cannot see. and any skill check that requires the view automatically fails.

## Is your website accessible to blind users? The | Proxies123.com

I am a blind internet marketer, … and I am qualified to share what a blind person goes through the web …

So, … I will publish some of the main obstacles for blind users …

Most people are not aware of the difficulty of navigating the World Wide Web …

The number one on my list is, … "Captia" …

Yes, … capture are the blind people, the worst enemy … in my opinion.

Think about it … you don't have sight but they ask you to write what you "see" in the box?

There are ways to avoid this, however …

Use the audio option along with the regular capture …

I think the best ones are the ones that ask you to solve the numerical question …

OK, … I will publish more nere in future publications …

## sqlmap: set the Boolean blind injection method instead of time

So I managed to enter the database and they gave me the following vulnerabilities

Parameter: postids (GET)
Type: boolean-based blind
Title: Boolean-based blind - Parameter replace (original value)
Payload: d=1&cmd=get_spam_data&postids=(SELECT (CASE WHEN (1972=1972) THEN 2 ELSE (SELECT 1472 UNION SELECT 7373) END))

Type: time-based blind
Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
Payload: d=1&cmd=get_spam_data&postids=2 AND (SELECT 9066 FROM (SELECT(SLEEP(5)))VKKG)


When I run a database query, it seems to be based on time by default instead of the fastest Boolean. I am not interested in waiting an hour for the database search to end. I tried the default value –technique, which is first Boolean but still the default.

## Cast spells while blind – Role playing game exchange

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## How do I exploit a generic SQL (blind) SQL injection vulnerability? [on hold]

The target device uses Apache HTTP Server Version 2.2.99, as well as Webmin 1.820.

If this vulnerability is not exploitable, any other suggestions?