Proof It!

by Seth Bisen-Hersh

Answer:
CALCULUS

We solve the (ungimmicked) crossword puzzle, and find the clues to help find the theme: the title, 9-A and 98-A. Looking for something mathematical, we find 4 math classes in the grid (à la a word search).

The classes are highlighted in the grid below: TRIGONOMETRY, ALGEBRA, STATISTICS, and GEOMETRY.

1
T
2
C
3
M
4
P
5
L
6
E
7
B
8
E
9
M
10
A
11
T
12
H
13
B
R
A
I
14
N
15
B
E
A
T
I
T
16
P
I
L
O
T
17
P
A
R
T
A
18
O
R
G
A
N
S
19
S
L
A
N
T
20
A
M
I
21
G
22
W
B
23
O
L
D
24
B
A
D
R
E
P
25
P
B
26
S
27
E
R
28
R
S
29
I
30
T
L
L
31
M
R
S
32
B
I
33
G
T
O
E
34
R
U
M
35
S
!
36
R
E
L
O
37
S
M
38
H
39
B
Y
E
40
I
41
T
42
T
!
43
C
O
A
L
G
44
A
S
45
E
46
A
R
N
47
P
E
R
48
U
49
R
A
N
S
O
M
50
O
X
T
E
A
51
M
52
N
A
S
53
O
M
S
54
T
55
I
N
E
A
R
56
S
57
E
58
A
N
C
E
59
W
E
E
60
D
61
C
M
D
R
62
Y
U
P
P
I
E
S
63
R
A
E
64
F
O
E
65
I
66
R
V
67
P
T
S
D
!
68
L
69
Y
N
N
70
V
E
71
S
S
E
L
!
72
P
73
S
74
U
75
O
M
S
76
K
77
A
S
T
I
78
D
E
79
M
!
80
L
I
N
81
G
U
A
82
N
83
I
N
84
T
A
85
T
86
S
N
87
L
88
A
D
I
E
U
89
T
I
B
I
90
A
E
91
A
92
T
S
E
A
93
T
R
O
O
P
94
I
F
I
T
I
S
95
B
O
O
M
S
96
T
A
N
S
97
C
E
S
A
R
98
O
N
E
!

The clue for 98-A tells us the one missing from this list is the answer: CALCULUS.