emagix.org is free, which would allow some freedom with subdomains comprising both math(.emagix).org and other ideas : math.emagix.org : sch.emagix.org

Another thing to consider: there's nothing wrong to have tm in the code all over the place, even if the name does not contain t and m in that order.

Matham

Its contextual meanings usually refers to philosophy ( a bit like the greek "logos" ): Mind, language, view, thought… ( if you're interested, I will check with some professional sanskritists, considering any other possible meanings (more of less mystical) this word may have)

mathmax : fun, but main TLDs taken.

mathr.org (free)

mediatree.org

aljorithm (all domains free save .pro)

tamiz or tamix (One more thing about of "tamiz" – it means "clean" in Farsi ;)means 'sieve' in spanish. ( not often used )

treescheme

treeme (sounds like dream…)

tomath or tau-maths (It is tomate (for a logo) and "to math". Conflicting use of .net in

http://tomath.net with the same association)

amitam = immensité, many domains available

steem = scientific typesetting environment for…(the expansion of maths?)

thauma

Related to trees, org available :

taxonomix (a tree is a taxonomy)

streecture (scheme-tree-structure)

!! .org unavailable (most of times a suffix would be needed) :

trama (means 'fabric' in spanish ( not often used )

tomate (like above: green tomates are the dev versions; red ones are the stable ones)

tiamat (A dragon in the persian mythology)

thyme (thym en français; variant thymy has all domains free)