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Multicharacter variables

All variables in Mathsys are multicharacter. This means: 
x = 2
# x is now 2

a = 3
# a is now 3

ax
# ax is an independent variable
# it is not a*x

a x
# this is a*x because of implicit multiplication
This is akin to how it works in programming languages.

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Valid variables

Variables must follow the regular expression /(?i)(?!\b(?:inf|of|use|lim|Any|Infinite|Nexists|Number|Tensor|Undefined|Variable)\b)[A-Za-zº$%]+/. This might change in the following update, removing the (?i) particle and expanding possible identifiers. Note keywords excluded. Variables matching exactly greek letters (e.g. pi), get transpiled to LaTeX on their symbolic form for representation purposes.