Travels: my travels, I am the traveller (literally).
Mathematical World is overtly to suggest I will be travelling around meeting mathematicians and inhabiting the world of that community. Beyond this, since I am actually travelling around the UK and hope to see how applied mathematics relates to everyday life it is also to indicate that actually the mathematical world is no different from the rest of the world; that in fact mathematics is in everything around us.
It is a mathematical world to highlight that I can only write about the world as I experience it, and others might see difference views.
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A note on the title