| Mathematician whose work pioneered concepts represented by the symbol at the center of this puzzle |
EULER |
| Meditative discipline |
ZEN |
| Mme. counterpart |
SRA |
| Note next to an F? |
SEEME |
| One in the fold |
EWE |
| One whose business is picking up |
MAID |
| Org. that sued the NSA in 2013 |
ACLU |
| P's on sorority sweaters |
RHOS |
| Philosopher who contemptuously coined the term at 31 Down in its mathematical context |
DESCARTES |
| Reverberated |
RANG |
| Sacred receptacle |
ARK |
| Scoundrels |
ROGUES |
| See 13 Down |
OFNEGATIVEONE |
| Selling points? |
SHOPS |
| She, in Sardinia |
ESSA |
| Shrink-resistant synthetic fiber |
ORLON |
| Smith who proposed 'the invisible hand' |
ADAM |
| Something in a crumbled state in Athens? |
FETA |
| Son of Isaac and Rebekah |
ESAU |
| Spot for strikes |
LANE |
| Spread created by Margaret Mitchell |
TARA |
| Subject of the musical 'Song of Norway' |
GRIEG |
| Sun Devil Stadium city |
TEMPE |
| Super Mario Bros. console |
NES |
| Swaggering, maybe |
MACHO |
| Take down a notch |
ABASE |
| Takes too much of, briefly |
ODSON |
| The Lorax claims to speak for them |
TREES |
| They're short in the U.S. and long in the U.K |
TONS |
| Toon whirlwind |
TAZ |
| Tunes performed by a 49 Down, perhaps |
SKA |
| Unseal furtively, in a way |
STEAMOPEN |
| Unsubtle flirt |
OGLER |
| Verbalizes |
SAYS |
| Victimized with one's endgame, say |
MATED |
| What an ace might ice |
ARM |
| With 14 Down, an expression of the symbol at the center of this puzzle |
THESQUAREROOT |