For this reason they are uncompetitive from an economic point of view. However, these tablets rival the multi-faceted tablets with the Android or iOS (Apple) operating systems that, for a similar price, can capture writing and additionally allow the user to browse the internet, which-thanks to cloud technologies-make it possible to perform tasks such as the edition of office texts, calculations and many others, without the need to install software. Higher-range Wacom tablets have a screen where the user can see the strokes as they are written and can write with total ease. For inexperienced users, it is difficult to create formulas in a real-time conversation (see ). On the other hand, there are other specialised word processors, such as LATEX distributions, which produce high-quality graphics and symbols, but whose learning curve is slow. While many office systems-such as Microsoft Office, OpenOffice from the Apache Foundation, or LibreOffice from The Document Foundation-include word processors that offer the possibility of composing mathematical equations, these are very limited, simply allowing the user to “drag and drop” from a list of signs (such as fractions, powers, matrices, integrals, etc.). Almost all students, and many teachers, are unaware of the existence of word processors with equation editors that are efficient (in terms of speed and precision). The abundance of symbols in mathematics-related subjects is an obstacle to the flow of written communication: Signs are not limited to the letters of our alphabet, but include diagrams, arrows, graphics and special characters, which are not easy to produce using a conventional computer keyboard (see ). Over 120 institutions are part of a prestigious cast of Edx partners. In addition, the Edx Educational and Learning Platform founded by Harvard and MIT in 2012, currently offers over 3000 courses with approximately 20 million students. Harvard University has approximately 360,000 non-US students taking distance education courses. The Massachusetts Institute of Technology offered distance learning in 33 different academic disciplines in 2017, via the MITx Courses Platform today these disciplines offer more than 400 courses. For example, more than 11,400 free courses can be accessed at (accessed on 10 January 2021). They offer Massive Online Open Courses, as well as regular training (degrees and postgraduate courses) online.
Each year there are more courses of this type on offer, as most universities do not want to be left out of this new scenario and are strongly committed to this modality. This is crucial in the case of courses that are carried out entirely online, which are very common nowadays. One of the greatest difficulties for the teaching community in scientific and technical subjects is the way in which they communicate their discipline to distance learning students.
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